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Chicago Weather Records Tracking


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15 minutes ago, TheClimateChanger said:

On the whole, the 1800s were quite a bit colder. The official coldest yearly mean in Chicago history is 45.1F, from 1875. However, the mean temperature was 45F in 1855, 43F in 1856, 44F in 1857, 44.9F in 1860, 45.1 in 1862, 44.3F in 1863, 42.5F in 1864, and 44.3F in 1865, according to records published by the United States Weather Bureau in 1947.

The normals for 1947, which at that time were based on the 50-year period from 1878-1927, adjusted to airport exposure, are given below. The normal temperature for December was 26.9F, for January 22.3F, for February 24.9F, and for March 34.5F. By comparison, the current normals for O'Hare are: December, 30.5F; January, 25.2F; February, 28.8F; and March, 39.0F. These values are 3.6F, 2.9F, 3.9F, and 4.5F warmer than the reported 1947 Midway norms.

image.thumb.png.edc70de7b4d5a30bb4f35c2522345589.png

Chicago was also a bit drier in the past, particularly from April through August. The current normal is just shy of 5" more than the old MDW norms, with the bulk of the difference occurring in the warm season. I thought maybe it was because MDW is simply drier than ORD, but NowData shows a normal annual precipitation of 40.88" for MDW.

image.thumb.png.9d2a3651ba538fb23653cfbc114edeb6.png

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  • 4 weeks later...

Naturally interested in these data summaries, see my Toronto and New York City data analyses in the climate change forum here. 

If somebody can post links to all similar data for Chicago I could work up simiar tables. FWIW my urban heat island assessment for Toronto is an average increase of 1.1 C or 2.0 F occurring in 0.1 C increments per decade, starting with 1881-1890 when the city began to surround the location of the now-downtown (but originally edge of town) university campus location. Of course this is an average for different situations, a cool, dry month with a lot of clear nights would have a larger differential than a humid, wet month. I have applied the same set of adjustments to NYC data with the assumption that a larger heat island of 1.4 C began to appear before NYC data started in 1869. That makes the period 1869 to 1880 if unadjusted, 0.2 C warmer, and the first decade adjusted for Toronto 0.3 C warmer (1881-90). But as the data are only being ranked against each other, those additional adjustments make no difference to ranking outcomes.

Is there a link to daily records, and if so, would ORD have incorporated older records from a different location? If not, is there a set of daily records that does span a longer interval? As it happens, it took only four days for Toronto to establish its first daily record (March 4th, 1840) that has somehow managed to persist to the present time. There are very few others on the warm side that lasted very long. One factor for Toronto is that a cooling lake breeze could more easily reach the location of the downtown weather station before the advent of multi-storey buildings around 1900. This wall of skyscrapers nowadays is a real inhibiting factor and the lake breeze tends to make better progress inland on either side of downtown Toronto. I suppose for Chicago the frequency of cooling lake breezes would be lower given the wind directions involved. Toronto is quite often in a south to east wind flow in spring anyway so the lake breeze is quite often a factor there.  

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https://www.weather.gov/lot/observation_history

^ Here’s a link to the obs locations for Chicago weather records, back to the 1870s. Unfortunately the official site has changed a lot, so it’s hard to compare apples to apples over time. ORD is much different than downtown/lakeside, whether due to lake impacts or UHI (although the UHI at ORD keeps worsening over time). 

ORD has been the official site since 1980, even as ORD data goes back to 1959.

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On 7/28/2023 at 3:20 PM, Roger Smith said:

Naturally interested in these data summaries, see my Toronto and New York City data analyses in the climate change forum here. 

If somebody can post links to all similar data for Chicago I could work up simiar tables. FWIW my urban heat island assessment for Toronto is an average increase of 1.1 C or 2.0 F occurring in 0.1 C increments per decade, starting with 1881-1890 when the city began to surround the location of the now-downtown (but originally edge of town) university campus location. Of course this is an average for different situations, a cool, dry month with a lot of clear nights would have a larger differential than a humid, wet month. I have applied the same set of adjustments to NYC data with the assumption that a larger heat island of 1.4 C began to appear before NYC data started in 1869. That makes the period 1869 to 1880 if unadjusted, 0.2 C warmer, and the first decade adjusted for Toronto 0.3 C warmer (1881-90). But as the data are only being ranked against each other, those additional adjustments make no difference to ranking outcomes.

Is there a link to daily records, and if so, would ORD have incorporated older records from a different location? If not, is there a set of daily records that does span a longer interval? As it happens, it took only four days for Toronto to establish its first daily record (March 4th, 1840) that has somehow managed to persist to the present time. There are very few others on the warm side that lasted very long. One factor for Toronto is that a cooling lake breeze could more easily reach the location of the downtown weather station before the advent of multi-storey buildings around 1900. This wall of skyscrapers nowadays is a real inhibiting factor and the lake breeze tends to make better progress inland on either side of downtown Toronto. I suppose for Chicago the frequency of cooling lake breezes would be lower given the wind directions involved. Toronto is quite often in a south to east wind flow in spring anyway so the lake breeze is quite often a factor there.  

You can always pull up the station histories from the monthly and annual weather reviews under Local Climatological Data (LCD) on the NCDC Image and Publication System: https://www.ncdc.noaa.gov/IPS/lcd/lcd.html

These also tell exactly when the extreme thermometers were replaced with hygrothermometers, as well as the elevation of all of the instruments above ground level (and the elevation of the observation site above sea level).

For example, here is the station history in the 1979 annual summary for MDW:

image.png.6239694587e321bcd62be85ae946552d.png

And in the 1987 annual summary for ORD:

image.png.db62de974f17017500fa968164ac4e52.png

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On 7/28/2023 at 3:20 PM, Roger Smith said:

Naturally interested in these data summaries, see my Toronto and New York City data analyses in the climate change forum here. 

If somebody can post links to all similar data for Chicago I could work up simiar tables. FWIW my urban heat island assessment for Toronto is an average increase of 1.1 C or 2.0 F occurring in 0.1 C increments per decade, starting with 1881-1890 when the city began to surround the location of the now-downtown (but originally edge of town) university campus location. Of course this is an average for different situations, a cool, dry month with a lot of clear nights would have a larger differential than a humid, wet month. I have applied the same set of adjustments to NYC data with the assumption that a larger heat island of 1.4 C began to appear before NYC data started in 1869. That makes the period 1869 to 1880 if unadjusted, 0.2 C warmer, and the first decade adjusted for Toronto 0.3 C warmer (1881-90). But as the data are only being ranked against each other, those additional adjustments make no difference to ranking outcomes.

Is there a link to daily records, and if so, would ORD have incorporated older records from a different location? If not, is there a set of daily records that does span a longer interval? As it happens, it took only four days for Toronto to establish its first daily record (March 4th, 1840) that has somehow managed to persist to the present time. There are very few others on the warm side that lasted very long. One factor for Toronto is that a cooling lake breeze could more easily reach the location of the downtown weather station before the advent of multi-storey buildings around 1900. This wall of skyscrapers nowadays is a real inhibiting factor and the lake breeze tends to make better progress inland on either side of downtown Toronto. I suppose for Chicago the frequency of cooling lake breezes would be lower given the wind directions involved. Toronto is quite often in a south to east wind flow in spring anyway so the lake breeze is quite often a factor there.  

Unofficial data for the period 1830-1870 is available in the 1943 Annual Weather Review for MDW. It is based on records of the War Department at Fort Dearborn on Wacker Drive in present-day downtown Chicago, records of the Smithsonian Institution in various parts of the city, with some interpolation of missing data by other observations outside the city.

Note that temperature means during this era were generally taken as the average of three measurements (typically 7am, 2pm, and 9pm), which tends to have a small warm bias compared to the average of maximum and minimum. This warm bias is most significant in the summertime. Recall this predates daylight saving time, and time zones, at least in the early part of that period. So these would have actually been observed after 8 am in the summertime [perhaps as late as 8:30, 8:45 if prior to standardized time zones], and would have been several degrees above the actual low. The inclusion of the 9 pm [actually equivalent to readings taken at 10 pm or later in the summertime during modern daylight saving time] reading somewhat mitigates this effect, but does not entirely eliminate it.

image.png.ff5bb80f2a550978518fb2c190eb9daf.png

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Those older Chicago area records seem to correlate well with Toronto back to 1840 and to some extent Providence RI back to 1832 (details on those sources are in my thread). For example April 1844 was a lot warmer than most other Aprils of that era. Winters 1855 to 1857 were all very cold for at least some portion (1856 more sustained). Winter 1841-42 was a very mild winter.

 I have some records copied out from some source for Fort Dearborn in the period 1782 to 1787. They show evidence of a very cold winter in 1783-84. 

The reversal of temperatures in winter 1857 from Jan (extreme cold) to Feb (record warm) came with severe ice jam flooding in many areas. It basically went from one extreme to another between Jan 22-24 and Feb 7-15. 

July 1868 was very hot in Toronto and with some adjustment for urban heat island in later data, is fairly close to being as hot as any later summer month. It was quite an outlier, as most other summers of the era were no warmer than what we might consider average. 1854 also had a rather hot summer. 

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  • 4 weeks later...
Chicago/O'Hare had a high temperature of 98° yesterday (August 23rd), which broke the record high temperature for the date of 97°, which was set in 1947.
 
Chicago/O'Hare had a low temperature of 77° on yesterday (August 23rd), which broke the record high minimum temperature for the date of 76°, which was set in 1968.
 
Chicago/O'Hare had a high temperature of 100° today (August 24th), which tied the record high temperature for the date of 100°, which was set in 1947.
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  • 2 months later...

RECORD EVENT REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
138 AM CDT FRI OCT 27 2023

...RECORD HIGH MINIMUM TEMPERATURE SET AT CHICAGO-OHARE...

A RECORD HIGH MINIMUM TEMPERATURE OF 65 WAS SET AT CHICAGO-OHARE 
YESTERDAY. THIS BEATS THE OLD RECORD OF 63 SET IN 1939.
 

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5 hours ago, Danny8 said:

RECORD EVENT REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
138 AM CDT FRI OCT 27 2023

...RECORD HIGH MINIMUM TEMPERATURE SET AT CHICAGO-OHARE...

A RECORD HIGH MINIMUM TEMPERATURE OF 65 WAS SET AT CHICAGO-OHARE 
YESTERDAY. THIS BEATS THE OLD RECORD OF 63 SET IN 1939.
 

This was also the 3rd warmest min on record for so late in the season. Min was also 65 on 10/29/1946 and 10/31/1974. Highest min on record for November is 63. 

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Halloween 2023 finished as the 5th coldest and 2nd snowiest Halloween on record for Chicago.

Top 10 Coldest Halloween's:
1. 31 - 1873
2. 32 - 1917
3. 33 - 2019
4. 37 - 1878
5. 38 - 2023
6. 39 - 1930
6. 39 - 1906
6. 39 - 1874
9. 40 - 2017
9. 40 - 1996
9. 40 - 1954

Top 10 Snowiest Halloween's:
1. 3.4" - 2019
2. 0.9" - 2023
3. 0.1" - 2014
4. T - 1993
4. T - 1955
4. T - 1926
4. T - 1918
4. T - 1917

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  • 1 month later...

A few stats to watch for on Christmas Eve and Christmas Day. Top 10, if not top 5, a lock for pretty much each list.

Warmest Christmas Eve Max Temps
1. 64 - 1889
2. 62 - 1982
3. 59 - 1877
4. 58 - 1932
4. 58 - 1893
4. 58 - 1875
7. 57 - 2021
8. 55 - 2019
9. 54 - 1936
9. 54 - 1895

Warmest Christmas Eve Min Temps
1. 51 - 1982
2. 49 - 1877
3. 46 - 1893
3. 46 - 1889
5. 40 - 1888
6. 39 - 1931
7. 38 - 1932
8. 37 - 1979
8. 37 - 1875

Warmest Christmas Day Max Temps
1. 64 - 1982
2. 57 - 2019
3. 56 - 1936
3. 56 - 1895
5. 55 - 2021
5. 55 - 1971
7. 52 - 1994
7. 52 - 1893
7. 52 - 1891
10. 50 - 1940
10. 50 - 1877

Warmest Christmas Day Min Temps
1. 46 - 1936
2. 42 - 1940
2. 42 - 1877
4. 37 - 2019
5. 36 - 1982
6. 35 - 1957
6. 35 - 1941
6. 35 - 1888
6. 35 - 1881
10. 34 - 1973
10. 34 - 1923
10. 34 - 1913
10. 34 - 1891

Wettest Christmas Day
1. 0.50" - 1950
1. 0.50" - 1909
3. 0.47" - 1982
4. 0.46" - 2009
5. 0.38" - 1957
6. 0.35" - 1973
6. 0.35" - 1949
8. 0.34" - 1965
8. 0.34" - 1879
8. 0.34" - 1877

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As expected, cracked the top 10 or top 5 on every list...

•Tied 8th warmest max temp on Christmas Eve.
•3rd warmest min temp on Christmas Eve.
•2nd warmest max temp on Christmas Day.
•Warmest min temp on Christmas Day.
•5th wettest Christmas Day.

Top 10 Warmest Christmas Eve Max Temps
1. 64 - 1889
2. 62 - 1982
3. 59 - 1877
4. 58 - 1932
4. 58 - 1893
4. 58 - 1875
7. 57 - 2021
8. 55 - 2023
8. 55 - 2019
10. 54 - 1936
10. 54 - 1895

Top 10 Warmest Christmas Eve Min Temps
1. 51 - 1982
2. 49 - 1877
3. 48 - 2023
4. 46 - 1893
4. 46 - 1889
6. 40 - 1888
7. 39 - 1931
8. 38 - 1932
9. 37 - 1979
9. 37 - 1875

Top 10 Warmest Christmas Day Max Temps
1. 64 - 1982
2. 59 - 2023
3. 57 - 2019
4. 56 - 1936
4. 56 - 1895
6. 55 - 2021
6. 55 - 1971
8. 52 - 1994
8. 52 - 1893
8. 52 - 1891

Top 10 Warmest Christmas Day Min Temps
1. 50 - 2023
2. 46 - 1936
3. 42 - 1940
3. 42 - 1877
4. 37 - 2019
6. 36 - 1982
7. 35 - 1957
7. 35 - 1941
7. 35 - 1888
7. 35 - 1881

Top 10 Wettest Christmas Day's
1. 0.50" - 1950
1. 0.50" - 1909
3. 0.47" - 1982
4. 0.46" - 2009
5. 0.39" - 2023
6. 0.38" - 1957
7. 0.35" - 1973
7. 0.35" - 1949
9. 0.34" - 1965
9. 0.34" - 1879
9. 0.34" - 1877

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December 2023 finished tied for the 4th warmest December on record.

Top 10 Warmest December's
1. 43.4 - 1877
2. 40.7 - 1889
3. 39.7 - 1923
4. 39.0 - 2023
4. 39.0 - 2015
6. 38.4 - 1931
7. 38.0 - 2021
8. 37.8 - 1881
9. 37.7 - 1918
10. 37.4 - 1971

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  • 3 weeks later...
On 2/1/2023 at 12:52 PM, Spartman said:

It's official! Chicago has experienced its cloudiest January ever with only 18% of sunshine. The previous record was 20% of sunshine back in January 1998. https://wgntv.com/weather/tom-skilling/skilling-just-how-cloudy-and-cold-was-january/

Last year, Chicago had its cloudiest January on record. This January doesn't seem to be an improvement from 2023.

January 2023:
 

000
CXUS53 KLOT 011748
CF6ORD
PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6)

                                          STATION:   CHICAGO-OHARE
                                          MONTH:     JANUARY
                                          YEAR:      2023
                                          LATITUDE:   41 58 N
                                          LONGITUDE:  87 54 W

  TEMPERATURE IN F:       :PCPN:    SNOW:  WIND      :SUNSHINE: SKY     :PK WND
================================================================================
1   2   3   4   5  6A  6B    7    8   9   10  11  12  13   14  15   16   17  18
                                     12Z  AVG MX 2MIN
DY MAX MIN AVG DEP HDD CDD  WTR  SNW DPTH SPD SPD DIR MIN PSBL S-S WX    SPD DR
================================================================================

 1  45  37  41  14  24   0 0.16  0.0    0  3.9 12 240   M    M  10 128    14 220
 2  43  32  38  11  27   0 0.00  0.0    0  6.5 15  50   M    M   9 12     20  60
 3  48  39  44  18  21   0 1.12    T    0  7.6 17  60   M    M  10 1235   22  50
 4  44  33  39  13  26   0    T  0.0    0  8.2 15 230   M    M   9 1      21 240
 5  34  32  33   7  32   0 0.02  0.2    0  8.5 15 250   M    M  10 1      20 260
 6  34  25  30   4  35   0    T    T    0  6.9 14 230   M    M  10 1      18 230
 7  32  27  30   4  35   0 0.00  0.0    0  5.8 13  50   M    M  10 8      18  50
 8  33  26  30   4  35   0 0.00  0.0    0  4.9 13 280   M    M  10 1      19 300
 9  44  25  35   9  30   0 0.00  0.0    0  8.4 15 210   M    M   6 18     23 220
10  50  34  42  17  23   0 0.00  0.0    0  4.9 12 160   M    M   6 8      16 160
11  57  38  48  23  17   0 0.00  0.0    0  3.4 15 150   M    M   9 18     19 160
12  43  36  40  15  25   0    T    T    0 14.4 28 360   M    M  10 128    35 360
13  36  26  31   6  34   0 0.02  0.2    0 14.3 23 360   M    M  10 1      30  10
14  31  24  28   3  37   0    T    T    0  7.4 14 170   M    M   9        18 160
15  44  26  35  10  30   0 0.00  0.0    0 12.9 21 160   M    M   8        30 160
16  52  40  46  21  19   0 0.18  0.0    0 13.8 21 240   M    M  10 1      32 240
17  49  37  43  18  22   0 0.00  0.0    0 14.7 24 250   M    M  10 18     34 240
18  41  36  39  14  26   0 0.24    T    0 10.7 28 100   M    M  10 14     39  90
19  42  34  38  13  27   0 0.14    T    0  8.8 20 280   M    M  10 18     29 290
20  35  29  32   7  33   0    T    T    0 10.7 17 300   M    M  10 1      25 280
21  32  28  30   6  35   0 0.00  0.0    0  7.8 15 200   M    M  10        19 210
22  34  26  30   6  35   0 0.13  1.5    1  4.9 13 350   M    M  10 1      17  50
23  30  21  26   2  39   0    T    T    0 12.0 21 250   M    M   9 156    31 210
24  36  28  32   8  33   0 0.00  0.0    0  6.3 15 280   M    M  10        21 250
25  34  31  33   8  32   0 0.30  3.6    2  8.3 14 320   M    M  10 18     21 350
26  32  15  24  -1  41   0 0.04  0.8    2 10.4 20 250   M    M  10 1      26 240
27  36  13  25   0  40   0 0.06  0.8    2 15.3 26 260   M    M   6 129    41 250
28  31  19  25   0  40   0 0.15  2.2    1  8.3 17  70   M    M   9 146    24  60
29  31  18  25   0  40   0 0.02  0.2    3 10.8 20 350   M    M  10 146    24 350
30  18   5  12 -13  53   0 0.02  0.4    3  9.7 15 310   M    M   7        21 320
31  12  -1   6 -19  59   0 0.00  0.0    3  6.1 13 260   M    M   2        18 250
================================================================================
SM 1163  839      1005   0  2.60  9.9    276.6          M      279
================================================================================
AV 37.5 27.1                               8.9 FASTST   M    M   9    MAX(MPH)
                                 MISC ---->  # 28 360                 41 250
================================================================================
NOTES:
# LAST OF SEVERAL OCCURRENCES

COLUMN 17 PEAK WIND IN M.P.H.

PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6) , PAGE 2

                                          STATION:   CHICAGO-OHARE
                                          MONTH:     JANUARY
                                          YEAR:      2023
                                          LATITUDE:   41 58 N
                                          LONGITUDE:  87 54 W

[TEMPERATURE DATA]      [PRECIPITATION DATA]       SYMBOLS USED IN COLUMN 16

AVERAGE MONTHLY: 32.3   TOTAL FOR MONTH:   2.60    1 = FOG OR MIST
DPTR FM NORMAL:   7.1   DPTR FM NORMAL:    0.61    2 = FOG REDUCING VISIBILITY
HIGHEST:    57 ON 11    GRTST 24HR  1.12 ON  3- 3      TO 1/4 MILE OR LESS
LOWEST:     -1 ON 31                               3 = THUNDER
                        SNOW, ICE PELLETS, HAIL    4 = ICE PELLETS
                        TOTAL MONTH:   9.9 INCHES  5 = HAIL
                        GRTST 24HR   3.6 ON 25-25  6 = FREEZING RAIN OR DRIZZLE
                        GRTST DEPTH:   3 ON 31,30  7 = DUSTSTORM OR SANDSTORM:
                                                       VSBY 1/2 MILE OR LESS
                                                   8 = SMOKE OR HAZE
[NO. OF DAYS WITH]      [WEATHER - DAYS WITH]      9 = BLOWING SNOW
                                                   X = TORNADO
MAX 32 OR BELOW:   9    0.01 INCH OR MORE:  14
MAX 90 OR ABOVE:   0    0.10 INCH OR MORE:   8
MIN 32 OR BELOW:  21    0.50 INCH OR MORE:   1
MIN  0 OR BELOW:   1    1.00 INCH OR MORE:   1

[HDD (BASE 65) ]
TOTAL THIS MO.  1005    CLEAR  (SCALE 0-3)   1
DPTR FM NORMAL  -229    PTCLDY (SCALE 4-7)   5
TOTAL FM JUL 1  3171    CLOUDY (SCALE 8-10) 25
DPTR FM NORMAL  -277

[CDD (BASE 65) ]
TOTAL THIS MO.     0
DPTR FM NORMAL     0    [PRESSURE DATA]
TOTAL FM JAN 1     0    HIGHEST SLP 30.49 ON 31
DPTR FM NORMAL     0    LOWEST  SLP 29.43 ON 19

[REMARKS]
#FINAL-01-23#

This January (to date):
 

000
CXUS53 KLOT 270800
CF6ORD
PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6)

                                          STATION:   CHICAGO-OHARE
                                          MONTH:     JANUARY
                                          YEAR:      2024
                                          LATITUDE:   41 58 N
                                          LONGITUDE:  87 54 W

  TEMPERATURE IN F:       :PCPN:    SNOW:  WIND      :SUNSHINE: SKY     :PK WND
================================================================================
1   2   3   4   5  6A  6B    7    8   9   10  11  12  13   14  15   16   17  18
                                     12Z  AVG MX 2MIN
DY MAX MIN AVG DEP HDD CDD  WTR  SNW DPTH SPD SPD DIR MIN PSBL S-S WX    SPD DR
================================================================================

 1  32  27  30   3  35   0    T    T    0 10.1 18 340   M    M  10        25 240
 2  39  26  33   6  32   0    T    T    0 12.0 22 230   M    M   8 18     30 210
 3  36  31  34   8  31   0    T    T    0  7.2 14 300   M    M  10 16     18 350
 4  37  24  31   5  34   0 0.00  0.0    0  4.8 16 350   M    M   6        20 350
 5  37  26  32   6  33   0 0.01  0.1    0  6.6 13 120   M    M   8 1      17 120
 6  34  31  33   7  32   0 0.21  2.6    2  4.3 10 110   M    M  10 14     14 110
 7  34  31  33   7  32   0 0.02  0.8    3  7.9 14 260   M    M  10 18     19 280
 8  36  30  33   7  32   0 0.08  0.4    1  8.9 18 100   M    M  10 1      24 100
 9  36  33  35   9  30   0 0.93  2.8    1 13.2 23 310   M    M  10 124    34 320
10  34  30  32   7  33   0    T  0.1    2 12.0 23 310   M    M  10 1      33 310
11  34  27  31   6  34   0 0.01  0.3    2  8.2 22 270   M    M   9 18     30 260
12  36  30  33   8  32   0 0.77  4.7    2 13.4 37  90   M    M  10 1248   55  90
13  33   1  17  -8  48   0 0.09  2.4    5 16.5 28 260   M    M  10 19     39 260
14   3 -10  -3 -28  68   0    T    T    4 16.2 26 270   M    M   5 89     40 280
15   2 -10  -4 -29  69   0 0.00  0.0    4 10.9 16 260   M    M   7        24 260
16   3  -7  -2 -27  67   0 0.00  0.0    4 16.0 24 240   M    M   3        34 240
17  20   2  11 -14  54   0 0.00  0.0    4 12.9 22 230   M    M   7        30 230
18  28  12  20  -5  45   0 0.06  0.8    4  6.4 16 340   M    M   9 1      22 340
19  14   5  10 -15  55   0 0.04  1.1    5 14.0 20 320   M    M   9 18     27 320
20  18   4  11 -14  54   0 0.00  0.0    4  9.9 15 310   M    M   3        21 320
21  21   1  11 -13  54   0 0.00  0.0    4  9.8 20 190   M    M   5        27 200
22  34  21  28   4  37   0 0.03    T    4 11.3 21 220   M    M  10 1456   31 200
23  37  33  35  11  30   0 0.36  0.0    4  3.7  9 100   M    M  10 16     14  20
24  38  34  36  12  29   0 0.18  0.0    3  5.9 12  40   M    M  10 12     20  10
25  38  35  37  12  28   0 0.28  0.0    1  9.0 16  20   M    M  10 12     26  40
26  40  37  39  14  26   0 0.38  0.0    0  5.9 16  20   M    M  10 1      21  30
================================================================================
SM  754  504      1054   0  3.45 16.1    257.0          M      219
================================================================================
AV 29.0 19.4                               9.9 FASTST   M    M   8    MAX(MPH)
                                 MISC ---->    37  90                 55  90
================================================================================
NOTES:
# LAST OF SEVERAL OCCURRENCES

COLUMN 17 PEAK WIND IN M.P.H.

PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6) , PAGE 2

                                          STATION:   CHICAGO-OHARE
                                          MONTH:     JANUARY
                                          YEAR:      2024
                                          LATITUDE:   41 58 N
                                          LONGITUDE:  87 54 W

[TEMPERATURE DATA]      [PRECIPITATION DATA]       SYMBOLS USED IN COLUMN 16

AVERAGE MONTHLY: 24.2   TOTAL FOR MONTH:   3.45    1 = FOG OR MIST
DPTR FM NORMAL:  -1.1   DPTR FM NORMAL:    1.74    2 = FOG REDUCING VISIBILITY
HIGHEST:    40 ON 26    GRTST 24HR  0.93 ON  9- 9      TO 1/4 MILE OR LESS
LOWEST:    -10 ON 15,14                             3 = THUNDER
                        SNOW, ICE PELLETS, HAIL    4 = ICE PELLETS
                        TOTAL MONTH:  17.0 INCHES  5 = HAIL
                        GRTST 24HR   4.7 ON 12-12  6 = FREEZING RAIN OR DRIZZLE
                        GRTST DEPTH:   5 ON 19,13  7 = DUSTSTORM OR SANDSTORM:
                                                       VSBY 1/2 MILE OR LESS
                                                   8 = SMOKE OR HAZE
[NO. OF DAYS WITH]      [WEATHER - DAYS WITH]      9 = BLOWING SNOW
                                                   X = TORNADO
MAX 32 OR BELOW:   9    0.01 INCH OR MORE:  15
MAX 90 OR ABOVE:   0    0.10 INCH OR MORE:   7
MIN 32 OR BELOW:  21    0.50 INCH OR MORE:   2
MIN  0 OR BELOW:   3    1.00 INCH OR MORE:   0

[HDD (BASE 65) ]
TOTAL THIS MO.  1054    CLEAR  (SCALE 0-3)   1
DPTR FM NORMAL    26    PTCLDY (SCALE 4-7)   8
TOTAL FM JUL 1  2816    CLOUDY (SCALE 8-10) 17
DPTR FM NORMAL  -432

[CDD (BASE 65) ]
TOTAL THIS MO.     0
DPTR FM NORMAL     0    [PRESSURE DATA]
TOTAL FM JAN 1     0    HIGHEST SLP M ON M
DPTR FM NORMAL     0    LOWEST  SLP 28.96 ON  9

[REMARKS]

Just for fun, January 2020:
 

173
CXUS55 KLOT 010700
CF6ORD
PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6)

                                          STATION:   CHICAGO-OHARE
                                          MONTH:     JANUARY
                                          YEAR:      2020
                                          LATITUDE:   41 58 N
                                          LONGITUDE:  87 54 W

  TEMPERATURE IN F:       :PCPN:    SNOW:  WIND      :SUNSHINE: SKY     :PK WND
================================================================================
1   2   3   4   5  6A  6B    7    8   9   10  11  12  13   14  15   16   17  18
                                     12Z  AVG MX 2MIN
DY MAX MIN AVG DEP HDD CDD  WTR  SNW DPTH SPD SPD DIR MIN PSBL S-S WX    SPD DR
================================================================================

 1  42  21  32   8  33   0 0.00  0.0    0 11.9 22 190   M    M   3        34 190
 2  48  37  43  19  22   0 0.00  0.0    0 11.7 22 190   M    M   5        32 190
 3  41  33  37  13  28   0 0.00  0.0    0  6.1 12 330   M    M  10        14 350
 4  33  26  30   6  35   0 0.03  0.5    1  9.2 16 310   M    M  10 18     24 300
 5  42  24  33   9  32   0 0.00  0.0    0 13.8 26 280   M    M   8        37 220
 6  42  27  35  11  30   0 0.00  0.0    0  9.5 16 260   M    M   5        24 270
 7  40  28  34  10  31   0 0.00  0.0    0 10.7 20 270   M    M   7        30 270
 8  29  14  22  -2  43   0 0.00  0.0    0 11.2 23 300   M    M   4        32 300
 9  50  23  37  13  28   0 0.02  0.0    0 16.1 26 200   M    M   9        39 200
10  50  36  43  19  22   0 0.84  0.0    0 11.4 26  20   M    M  10 12     34  30
11  37  25  31   7  34   0 0.37  2.1    0 25.0 39  20   M    M  10 129    52  10
12  31  23  27   3  38   0    T    T    2  6.5 16 150   M    M  10 168    22 160
13  33  31  32   8  33   0    T  0.2    2  8.3 20 270   M    M   8 1      26 280
14  39  25  32   8  33   0 0.00  0.0    1  8.5 22 240   M    M   8 1      29 230
15  36  25  31   7  34   0    T  0.0    0  8.0 22 320   M    M   8 1      31 290
16  29  11  20  -4  45   0    T    T    0 11.7 22 310   M    M   6        29 290
17  29  11  20  -3  45   0 0.37  3.1    0 10.5 25 120   M    M  10 12469  34 120
18  35   5  20  -3  45   0 0.40    T    2 15.8 31 270   M    M   9 168    46 270
19  19   2  11 -12  54   0    T    T    2 13.0 26 260   M    M   7        39 280
20  31  17  24   1  41   0    T    T    2  6.8 12 310   M    M   6        15 310
21  29  15  22  -2  43   0 0.00  0.0    2  7.7 17 230   M    M   3        24 230
22  34  24  29   5  36   0    T    T    2 12.2 18 180   M    M  10        29 190
23  34  29  32   8  33   0 0.17  0.9    2  7.6 15 190   M    M  10 1      22 180
24  37  32  35  11  30   0 0.40    T    1  4.7 13  80   M    M  10 12     17  80
25  34  32  33   9  32   0 0.12  0.4    1  8.2 15 260   M    M  10 16     21 230
26  33  27  30   6  35   0    T    T    1  9.3 15 230   M    M  10 1      20 250
27  35  27  31   7  34   0    T    T    0  5.8  9 340   M    M  10 16     12 270
28  33  31  32   8  33   0    T    T    0  5.8 12 300   M    M  10 1      17 300
29  34  30  32   8  33   0    T    T    0  4.7  9  20   M    M  10 8      11  20
30  35  32  34  10  31   0 0.00  0.0    0  3.6  9 170   M    M  10 8      14 190
31  37  32  35  11  30   0 0.08  0.6    0  5.3 10 170   M    M  10 18     14 160
================================================================================
SM 1111  755      1076   0  2.80     7.8 300.6          M      256
================================================================================
AV 35.8 24.4                               9.7 FASTST   M    M   8    MAX(MPH)
                                 MISC ---->  # 39  20               # 52   10
================================================================================
NOTES:
# LAST OF SEVERAL OCCURRENCES

COLUMN 17 PEAK WIND IN M.P.H.

PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6) , PAGE 2

                                          STATION:  CHICAGO-OHARE
                                          MONTH:    JANUARY
                                          YEAR:     2020
                                          LATITUDE:   41 58 N
                                          LONGITUDE:  87 54 W

[TEMPERATURE DATA]      [PRECIPITATION DATA]       SYMBOLS USED IN COLUMN 16

AVERAGE MONTHLY: 30.1   TOTAL FOR MONTH:   2.80    1 = FOG OR MIST
DPTR FM NORMAL:   6.3   DPTR FM NORMAL:    1.07    2 = FOG REDUCING VISIBILITY
HIGHEST:    50 ON 10, 9 GRTST 24HR  0.84 ON 10-10      TO 1/4 MILE OR LESS
LOWEST:      2 ON 19                               3 = THUNDER
                        SNOW, ICE PELLETS, HAIL    4 = ICE PELLETS
                        TOTAL MONTH:   7.8 INCHES  5 = HAIL
                        GRTST 24HR   3.1 ON 17-17  6 = FREEZING RAIN OR DRIZZLE
                        GRTST DEPTH:   2 ON 23,22  7 = DUSTSTORM OR SANDSTORM:
                                                       VSBY 1/2 MILE OR LESS
                                                   8 = SMOKE OR HAZE
[NO. OF DAYS WITH]      [WEATHER - DAYS WITH]      9 = BLOWING SNOW
                                                   X = TORNADO
MAX 32 OR BELOW:   7    0.01 INCH OR MORE:  10
MAX 90 OR ABOVE:   0    0.10 INCH OR MORE:   7
MIN 32 OR BELOW:  28    0.50 INCH OR MORE:   1
MIN  0 OR BELOW:   0    1.00 INCH OR MORE:   0

[HDD (BASE 65) ]
TOTAL THIS MO.  1076    CLEAR  (SCALE 0-3)   1
DPTR FM NORMAL  -203    PTCLDY (SCALE 4-7)  12
TOTAL FM JUL 1  3384    CLOUDY (SCALE 8-10) 18
DPTR FM NORMAL  -306

[CDD (BASE 65) ]
TOTAL THIS MO.     0
DPTR FM NORMAL     0    [PRESSURE DATA]
TOTAL FM JAN 1     0    HIGHEST SLP M ON M
DPTR FM NORMAL     0    LOWEST  SLP 29.31 ON 31

[REMARKS]
#FINAL-01-20#

 

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According to Tom Skilling, because the sun came back in Chicago on Monday, Chicago's overcast stretch ended at 7 consecutive days that matched an exact stretch occurring just last year and in 1998. If the sun didn't return Monday, Chicago's overcast stretch would've been 8 consecutive days and counting.

https://www.facebook.com/TomSkilling/posts/pfbid031tqr8jNe5QjMt8uq1549gSjkkTRUrF8tBHZ69iQAfCFxYJxegKxenAKX68s2JbMvl?__cft__[0]=AZWO58oiJkSoGVRunLpBslVBng0oTlhJvKJ8OumpAFruN4ouoUc0wXtDDVjgXNnTMPaOhuyri-tkLAJ5lEZdO6Xu-_q49LiJwMdgvbu4a8dGhXH-ugW8CCL80ZeliPHK8cvMqqa09lEMeiKQX1wLMfszq859KPjkLdLmDDgvPckayAUszEU__TeXIUM0Gweyo_Y&__tn__=%2CO%2CP-R

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  • 2 weeks later...

Several things to watch as we head towards the conclusion of February...

Warmest February's
1. 39.0° - 1882
2. 38.7° - 1998
3. 38.0° - 2017
4. 37.5° - 1954
5. 37.3° - 1877
6. 37.1° - 1930
7. 36.6° - 2024 (Thru 2/18)
8. 36.5° - 1878
9. 35.8° - 1976
10. 35.6° - 1931

Least Snowy February's
1. T - 2024 (Thru 2/18)
1. T - 2017
1. T - 1998
1. T - 1987
5. 0.3" - 1996
5. 0.3" - 1921
7. 0.4" - 1995
8. 0.4" - 1931
9. 0.5" - 1915
10. 0.9" - 1922

Driest February's
1. 0.06" - 1877
2. 0.10" - 2024 (Thru 2/18)
3. 0.13" - 1920
4. 0.19" - 2003
5. 0.25" - 1969
6. 0.33" - 1958
7. 0.38" - 1947
7. 0.38" - 1921
9. 0.41" - 1995
9. 0.41" - 1982

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2 hours ago, mimillman said:

we should still get warmest or near there I imagine 

Running the numbers just roughly off of the NWS forecast (Likely underdone a bit early next week), we are in the running for the top 5 warmest, but not close to 1st.

We would need temps to overperform their current forecast by quite a bit to make a run at the record warmest.

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3 hours ago, Chicago Storm said:

A tie for the least snowiest February is in serious jeopardy this evening/tonight.

Luckily, I'm working... :devilsmiley:

And just like that... We are not only out of the running for least snowy February on record, but we are out of the running for top 5 least snowy as well.

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