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December 2025 General Discussion


Brian D
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49 minutes ago, Chambana said:

Already down to -12 here

Right under the center of the high, it looks like. Assuming it stays above -14 before midnight, Champaign had a 1/-14 high/low today, which is a -36.5F departure from the 1991-2020 normal of 37/23.

The -14 low is the coldest temp on record for so early in the season, and records go back more than 130 years. Until today, there were only 2 days in history with a -10 or colder temp on or before December 14th:

12/10/1917: -10

12/11/1917: -12

https://stateclimatologist.web.illinois.edu/wp-content/uploads/2025/12/weather-almanac-2025_Dec.pdf

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1.5" today and the 19th straight day below freezing. That streak is scheduled to end tomorrow just as my snowpack is looking the best so far. Expecting to loose/settle a lot of it by Thursday evening when the cold shot makes it way back in here. Been a great stretch really.

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First half of the month at DLH is the 10th coldest. 3 days of warmer wx, and sloppy with the strong clipper incoming for Wed-Thurs. 

-4.40 1919-12-01 1919-12-15 1 1 1 0
-2.33 1972-12-01 1972-12-15 2 2 2 0
-0.27 1958-12-01 1958-12-15 3 3 3 0
1.27 1927-12-01 1927-12-15 4 4 4 0
1.33 1917-12-01 1917-12-15 5 5 5 0
3.67 1976-12-01 1976-12-15 6 6 6 0
4.50 1985-12-01 1985-12-15 7 7 7 0
5.10 2013-12-01 2013-12-15 8 8 8 0
5.30 2000-12-01 2000-12-15 9 9 9 0
6.33 2025-12-01 2025-12-15 10 10 10 0
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12 hours ago, TheClimateChanger said:

 

Ice is generally new/thin which would be typical this time of year. The warmer temps with gusty winds this week will knock it back pretty good as much of the detected ice is lower in concentrations across the Lakes. With such a cold start this year, the potential exists for a higher ice year with larger areas of thicker ice. Something we need to help the natural ecosystem. It actually helps to knock back some invasive species. 

Dec 15 W lakes ice.gif

Dec 15 E lakes ice.gif

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56 minutes ago, Geoboy645 said:

image.thumb.png.854cc83f9fe4ea22c0f6385f1a90c1f5.png
For records sake, the anomaly at Madison the first half of the month was -12.6 (!). We will see what it actually ends up being by the end of the month. 

10th coldest for Madison too. 

6.30 1919-12-01 1919-12-15 1 1 1 0
7.77 1972-12-01 1972-12-15 2 2 2 0
9.50 1958-12-01 1958-12-15 3 3 3 0
10.03 1917-12-01 1917-12-15 4 4 4 0
11.07 1976-12-01 1976-12-15 5 5 5 0
12.80 1898-12-01 1898-12-15 6 6 6 0
13.33 1893-12-01 1893-12-15 7 7 7 0
14.13 1876-12-01 1876-12-15 8 8 8 0
14.63 1942-12-01 1942-12-15 9 9 9 0
14.97 2025-12-01 2025-12-15 10 10 10 0
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First half of December was very impressive in its persistence of cold. Southern Michigan seemed the most impressive record-wise in terms of all-time placement, but widespread temp departures of -10F to -13F encompassed the sub. 


Flint: 3rd coldest in 105 years
Ann Arbor: 4th coldest in 145 years
Detroit: 5th coldest in 152 years
Grand Rapids: 5th coldest in 133 years
Green Bay: 6th coldest in 140 years
Toledo: 7th coldest in 153 years
Cleveland: 8th coldest in 155 years
Pittsburgh: 8th coldest in 151 years
Lansing: 12th coldest in 163 years
Chicago: 13th coldest in 154 years
Milwaukee: 13th coldest in 155 years

For Detroit, going back to 1906 (as far as I have records), 2025 is officially only the 2nd December to have 1”+ snowcover every day for the first half of December. The only other time was 1910. To be fair, we should include 1974, as a massive snowstorm hit on Dec 1st but the snow depth at 7am was just a T. Even then, only 1910, 1974, and 2025 were nonstop blanketed in snow the entire first half of December. 
 

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17 minutes ago, michsnowfreak said:

First half of December was very impressive in its persistence of cold. Southern Michigan seemed the most impressive record-wise in terms of all-time placement, but widespread temp departures of -10F to -13F encompassed the sub. 


Flint: 3rd coldest in 105 years
Ann Arbor: 4th coldest in 145 years
Detroit: 5th coldest in 152 years
Grand Rapids: 5th coldest in 133 years
Green Bay: 6th coldest in 140 years
Toledo: 7th coldest in 153 years
Cleveland: 8th coldest in 155 years
Pittsburgh: 8th coldest in 151 years
Lansing: 12th coldest in 163 years
Chicago: 13th coldest in 154 years
Milwaukee: 13th coldest in 155 years

For Detroit, going back to 1906 (as far as I have records), 2025 is officially only the 2nd December to have 1”+ snowcover every day for the first half of December. The only other time was 1910. To be fair, we should include 1974, as a massive snowstorm hit on Dec 1st but the snow depth at 7am was just a T. Even then, only 1910, 1974, and 2025 were nonstop blanketed in snow the entire first half of December. 
 

Lansing has records back in the 1860's which had some very cold winters. So I looked at how this year compared. Impressive to be sure.

15.63 1868-12-01 1868-12-15 1 1 1 0
16.93 1867-12-01 1867-12-15 2 2 2 0
17.20 1917-12-01 1917-12-15 3 3 3 0
17.20 1876-12-01 1876-12-15 3 3 4 0
17.33 1895-12-01 1895-12-15 5 4 5 0
17.53 1958-12-01 1958-12-15 6 5 6 0
18.47 1976-12-01 1976-12-15 7 6 7 0
18.70 1904-12-01 1904-12-15 8 7 8 0
19.33 1989-12-01 1989-12-15 9 8 9 0
19.43 1864-12-01 1864-12-15 10 9 10 0
19.77 1893-12-01 1893-12-15 11 10 11 0
19.90 2025-12-01 2025-12-15 12 11 12 0

 

Here's what MRCC has for Detroit

19.57 1958-12-01 1958-12-15 1 1 1 0
20.03 1917-12-01 1917-12-15 2 2 2 0
21.30 1876-12-01 1876-12-15 3 3 3 0
21.37 1976-12-01 1976-12-15 4 4 4 0
22.07 1895-12-01 1895-12-15 5 5 5 0
22.10 2025-12-01 2025-12-15 6 6 6 0
22.30 1989-12-01 1989-12-15 7 7 7 0
22.63 1937-12-01 1937-12-15 8 8 8 0
22.90 2005-12-01 2005-12-15 9 9 9 0
22.97 1893-12-01 1893-12-15 10 10 10 0
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1 hour ago, michsnowfreak said:

First half of December was very impressive in its persistence of cold. Southern Michigan seemed the most impressive record-wise in terms of all-time placement, but widespread temp departures of -10F to -13F encompassed the sub. 


Flint: 3rd coldest in 105 years
Ann Arbor: 4th coldest in 145 years
Detroit: 5th coldest in 152 years
Grand Rapids: 5th coldest in 133 years
Green Bay: 6th coldest in 140 years
Toledo: 7th coldest in 153 years
Cleveland: 8th coldest in 155 years
Pittsburgh: 8th coldest in 151 years
Lansing: 12th coldest in 163 years
Chicago: 13th coldest in 154 years
Milwaukee: 13th coldest in 155 years

For Detroit, going back to 1906 (as far as I have records), 2025 is officially only the 2nd December to have 1”+ snowcover every day for the first half of December. The only other time was 1910. To be fair, we should include 1974, as a massive snowstorm hit on Dec 1st but the snow depth at 7am was just a T. Even then, only 1910, 1974, and 2025 were nonstop blanketed in snow the entire first half of December. 
 

Thnk goodness its gonna be avg the rest of the year. Gotta have warmer temps to get the big snows.

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