bluewave

If we had a drought and this was a month later, then maybe the 2010 and 2011 highs of 108° could have been challenged. Hard to say for sure. But it’s interesting that this strongest heatwave in over a decade followed the record westerly flow this past winter into spring. Even though we are seeing a quick return to easterly flow. Plus continuing the measurable rainfall on weekend pattern without it being a washout. I guess we are lucky that we haven’t experienced any severe droughts like we had from the 1960s to around 2001. Since droughts of that magnitude with the warmer background pattern would probably support 110°+ peak heat and our first consecutive 10 days reaching 100° and perhaps a 25 day official heatwave of reaching 90°. While this heatwave only produced some scattered outages, not sure how well our power grid would hold up with such extreme drought feedback driven heat.

The other thing to watch going forward is the potential for a 10”+ rainfall event in a few hours or spread out over a month for someone in the area. Every other La Niña like this year since 1955 had one following the major 103°+ heat. While this isn’t a guarantee, it’s something to be aware of that happened in the past from the summer into early and mid fall. La Niña years with 10”+ rainfall daily or monthly events following peak 103°+ heat 2021 2011 2005 1999 1955

100°+ days at JFK and 80°+ minimums Maximum 1-Day Mean Max Temperature for JFK INTERNATIONAL AIRPORT, NY Click column heading to sort ascending, click again to sort descending. 1 104.0 1966-07-03 through 1966-07-03 2 103.0 2011-07-22 through 2011-07-22 3 102.0 2025-06-25 through 2025-06-25 - 102.0 2025-06-24 through 2025-06-24 - 102.0 2011-07-23 through 2011-07-23 - 102.0 1999-07-05 through 1999-07-05 - 102.0 1963-07-01 through 1963-07-01 4 101.0 2010-07-06 through 2010-07-06 - 101.0 2010-07-04 through 2010-07-04 - 101.0 1993-07-09 through 1993-07-09 - 101.0 1966-07-04 through 1966-07-04 - 101.0 1966-07-02 through 1966-07-02 - 101.0 1957-07-22 through 1957-07-22 - 101.0 1948-08-27 through 1948-08-27 5 100.0 2013-07-18 through 2013-07-18 - 100.0 2010-07-07 through 2010-07-07 - 100.0 1993-07-10 through 1993-07-10 - 100.0 1983-08-20 through 1983-08-20 - 100.0 1983-07-16 through 1983-07-16 - 100.0 1972-07-23 through 1972-07-23 - 100.0 1948-08-26 through 1948-08-26 Maximum 1-Day Mean Min Temperature for JFK INTERNATIONAL AIRPORT, NY Click column heading to sort ascending, click again to sort descending. 1 82.0 2016-08-14 through 2016-08-14 - 82.0 1999-07-06 through 1999-07-06 3 81.0 2025-06-25 through 2025-06-25 - 81.0 1983-07-16 through 1983-07-16 - 81.0 1980-08-09 through 1980-08-09 - 81.0 1959-06-30 through 1959-06-30 7 80.0 2019-07-21 through 2019-07-21 - 80.0 2016-08-13 through 2016-08-13 - 80.0 2013-07-19 through 2013-07-19 - 80.0 2010-07-24 through 2010-07-24 - 80.0 2006-08-02 through 2006-08-02 - 80.0 2002-07-04 through 2002-07-04 - 80.0 2001-08-08 through 2001-08-08 - 80.0 1999-07-05 through 1999-07-05 - 80.0 1993-07-10 through 1993-07-10 - 80.0 1981-07-09 through 1981-07-09

This was the strongest heatwave in our area that was ever recorded during the month of June. We had widespread 103° readings from NJ to Baiting Holllow on Eastern Long Island with multiple 105° readings in Queens. This may be the first 103° ever recorded on Eastern Long Island. The other thing on the list below is how these heatwaves have become earlier in the season. We haven’t one in August since 2006 and September since 1953. 103°+ heatwaves since 1936 and local maximum temperatures June 2025…..105° June 2021…..103° July 2012……104° July 2011……108° July 2010…..108° August 2006…103° July 2005….103° August 2001….105° July 1999…..104° July 1995…..104° July 1993…..105° July 1977……104° July 1966….107° August 1955….103° September 1953…..105° July 1949…..105° July 1948…..103° July 1936….106°

This was the strongest heatwave in our area that was ever recorded during the month of June. We had widespread 103° readings from NJ to Baiting Holllow on Eastern Long Island with multiple 105° readings in Queens. This may be the first 103° ever recorded on Eastern Long Island. So the list below is all the 103°+heatwaves since 1936 and the month which they occurred. There hasn’t been multiple 103°+ heatwaves in the same season before. I know that you really enjoy this type of heat. But I am hoping that this follows past examples and is the warmest we see for all of 2025. The other thing on the list below is how these heatwaves have become earlier in the season. We haven’t one in August since 2006 and September since 1953. 103°+ heatwaves since 1936 and local maximum temperatures June 2025…..105° June 2021…..103° July 2012……104° July 2011……108° July 2010…..108° August 2006…103° July 2005….103° August 2001….105° July 1999…..104° July 1995…..104° July 1993…..105° July 1977……104° July 1966….107° August 1955….103° September 1953…..105° July 1949…..105° July 1948…..103° July 1936….106°

International Falls getting their earliest 70° minimum by 35 days back in May was probably the most impressive temperature record for the CONUS this year so far at a +33° minimum. CLIMATE REPORT NATIONAL WEATHER SERVICE DULUTH MN 426 PM CDT MON MAY 12 2025 ................................... ...THE INTERNATIONAL FALLS CLIMATE SUMMARY FOR MAY 12 2025... VALID TODAY AS OF 0400 PM LOCAL TIME. CLIMATE NORMAL PERIOD: 1991 TO 2020 CLIMATE RECORD PERIOD: 1895 TO 2025 WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST VALUE (LST) VALUE VALUE FROM YEAR NORMAL ................................................................... TEMPERATURE (F) TODAY MAXIMUM 90R 2:59 PM 86 1991 63 27 67 MINIMUM 70 5:43 AM 18 2020 37 33 40 AVERAGE 80 50 30 54

No problem. If our area had low temperature extremes like places in Wisconsin, Minnesota, and Vermont in recent years, then we would see lows around 88° in Queens and 83° at HPN and ISP. We are fortunate that we still haven’t seen a warm season extreme here like the 80° back in February 2018. An equivalent July extreme would be a high of 112° in Queens and around Newark. With low temperatures near 90° in both locations. Under such a scenario even the surrounding more rural areas would reach 105-108° during the day and struggle to fall much below 84° and 85° for a low.

Take it easy. I was just commenting on our local area. Our minimums haven’t been as extreme as the Upper Midwest has been experiencing this year. UHI is the differential between urban and rural areas. But luckily the urban areas haven’t seen the minimums as extreme as the rural ones have especially like Wisconsin and International Falls back in May. Around NYC Metro it’s very difficult for the minimums to remain above 80° outside the urban centers. We have been fortunate so far not to have experienced the low temperature extremes necessary for spots outside NYC to stay above 80° for low temperatures in recent years. So while both urban and rural areas around NYC have seen a record number of low maxes in recent years, the most extreme all-time low maxes have been going to our north.

Yeah, UHI is the reason that only the urban centers experienced 80° minimums during this heatwave. But the reason for the record minimums across all rural and urban sites is the warmer climate supporting higher dewpoints. So a 70° minimum at MPO and an 80° minimum in NYC during June are similar warm monthly minimum benchmarks for each location. The urban center around NYC is lucky that they didn’t experience a low minimum temperature as extreme as BTV did several years back. This is when BTV recorded their first 80° minimum. An equivalent record low minimum around NYC Metro would be 88°. Thankfully this hasn’t happened yet. But maybe in the coming decade somebody in NYC gets their first low max just under 90°. RECORD EVENT REPORT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 0200 AM EDT TUE JUN 24 2025 ...RECORD DAILY AND MONTHLY HIGH TEMPERATURE AND RECORD WARMEST LOW TEMPERATURE SET AT MOUNT POCONO PA... A RECORD HIGH TEMPERATURE OF 93 DEGREES WAS SET AT MOUNT POCONO PA YESTERDAY. THIS BREAKS THE OLD RECORD OF 90 DEGREES SET IN 1908. THIS WAS THE FIRST 90 DEGREE OR HIGHER TEMPERATURE IN THE MOUNT POCONO AREA IN 12 YEARS, WHEN THE HIGH TEMPERATURE WAS 90 DEGREES ON JULY 19, 2013. THIS WAS ALSO THE HOTTEST TEMPERATURE IN THE MOUNT POCONO AREA SINCE JULY 18, 2012, WHEN THE HIGH TEMPERATURE WAS 94 DEGREES. ADDITIONALLY, THIS WAS THE WARMEST JUNE TEMPERATURE ON RECORD IN THE MOUNT POCONO AREA SINCE RECORDS BEGAN. THE PREVIOUS RECORD WARMEST JUNE TEMPERATURE WAS 92 DEGREES SET BACK ON JUNE 24, 1914... JUNE 9, 1933... AND JUNE 26, 1952. IN ADDITION TO THE RECORD HIGH TEMPERATURE, A RECORD WARMEST LOW TEMPERATURE OF 70 DEGREES WAS ALSO SET AT MOUNT POCONO PA YESTERDAY. THIS BREAKS THE OLD RECORD OF 69 DEGREES SET IN 2024. TEMPERATURE RECORDS FOR THE MOUNT POCONO PA AREA DATE BACK TO 1901.

Same theme. Just enough rain to keep the rain on the weekend streak going. But not enough for a complete wash out. But there could be a least some rain each day. Though the best beach weather continues to be on the weekdays. So it’s no surprise the models have a stalled front and rain chances for the July 4th weekend with weak waves of low pressure.

It’s possible that the next chance may be during the 2nd half of July at a lower level than this one was. The trough out West was very impressive. Though the cooler air is highly limited in the Northern Hemisphere with all the record heat, that area did manage to see some record lows. This matches the pattern of recent years with our warmest temperatures occurring with deep Western Troughs. Looks like the rain on the weekends pattern is set to continue.

This was a record event for late June in our area. The La Niña sample size for 103° or greater is very limited for the last 10 days of June. But 2021 was the last time. It turned out to be the highest summer temperatures we experienced that year. This extreme event was associated with a very deep trough diving into the West. Current models forecasts don’t show a trough returning to the West as we head into July. So my very early guess is that this could be the only 103° to 105° range we see this summer. But there could very well be another few 100°-102° days beyond this current period.

JFK could have reached 105° if the sea breeze didn’t arrive. The Lefferts/ Ozone Park station just to the north on the other side of the Belt Parkway reached 105°. Another nearby separate Ozone Park station also made it to 105°. Newark and Harrison in NJ both reached 103°. This is the earliest 105° across the area since 7-3-1966. So the first 105° readings in this area during the month of June. Corona 104 92 79 22 0.00 E 40th St. / Murray Hill 102 86 94 102 92 69 25 0.00 East River at Alphabet City Fresh Kills 102 79 92 105 79 90 29 0.00 18 9:35am 11 6:35pm 29.0 Glendale / Maspeth 102 83 94 103 90 78 23 0.00 Gold Street / Navy Yard 102 85 94 104 91 71 25 0.00 21 9:40am 10 9:05am 28.6 Lefferts / South Ozone Park 105 79 93 105 79 88 21 0.00 GW2248 OZONE PARK Observation Time: 06/25/25 @ 06:14 EDT 10:14 UTC Elevation: 22 ft OK Weather Conditions Temperature: 87 °F Dew Point: 71 °F Humidity: 60 % Peak Gust: 0 MPH 24 Hour Max/Min Events Max Temperature: 105 °F Min Temperature: 82 °F Max RH: 83 % Min RH: 26 % Max Dew Point: 77 °F Min Dew Point: 62 °F Max Gust: 7 MPH Data for June 1, 2025 through June 25, 2025 Click column heading to sort ascending, click again to sort descending. NJ NEWARK LIBERTY INTL AP WBAN 103 NJ HARRISON COOP 103 NY JFK INTERNATIONAL AIRPORT WBAN 102 NY LAGUARDIA AIRPORT WBAN 101 NJ TETERBORO AIRPORT WBAN 101 NJ CALDWELL ESSEX COUNTY AP WBAN 101 CT MERIDEN MARKHAM MUNICIPAL AP WBAN 101 NY ISLIP-LI MACARTHUR AP WBAN 101 NY FARMINGDALE REPUBLIC AP WBAN 100 NY SHIRLEY BROOKHAVEN AIRPORT WBAN 100

Pretty impressive to see POU beat daily record by +6°. CLIMATE REPORT NATIONAL WEATHER SERVICE ALBANY NY 439 PM EDT TUE JUN 24 2025 ................................... ...THE POUGHKEEPSIE NY CLIMATE SUMMARY FOR JUNE 24 2025... VALID TODAY AS OF 0400 PM LOCAL TIME. CLIMATE NORMAL PERIOD: 1991 TO 2020 CLIMATE RECORD PERIOD: 1931 TO 2025 WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST VALUE (LST) VALUE VALUE FROM YEAR NORMAL ................................................................... TEMPERATURE (F) TODAY MAXIMUM 100R 2:59 PM 94 1945 82 18 79

All official temperature readings are taken in the sun with a fan-aspirated radiation shield. Put that set up under a stand of mature trees and the temperature will drop from 3° to sometimes 5° degrees on warm sunny days. Prior to the 1990s the sensor and shield with the fan was in direct sunlight. So this sets up the discontinuity between the pre and post 1990s temperature readings from Central Park. This is why Newark and NYC used to trade places with which station was warmer from 1930 to 1980. It’s possible the tree growth was becoming an issue in the 80s to early 90s. But really became pronounced since the 1990s and especially since 2013.

The main point is that it wasn’t in the shade prior to the 1990s. Those trees grew up around and over that platform. So when all those old 90s and 100s records occurred from the 1930s into the 1980s, it had more of an open exposure like the current 102° a few blocks to the east. So subtract 3° to 5° from all those old records and there would have been hardly any days over 100° from the 1930s into the 1980s if the trees were there in those days.

RECORD EVENT REPORT NATIONAL WEATHER SERVICE NEW YORK, NY 307 PM EDT TUE JUN 24 2025 ...RECORD DAILY AND MONTHLY HIGH TEMPERATURE SET AT ISLIP MACARTHUR AIRPORT... THE HIGH TEMPERATURE REACHED 100 DEGREES SO FAR TODAY AT ISLIP MACARTHUR AIRPORT. THIS BREAKS THE OLD DAILY RECORD OF 96 DEGREES, SET IN 1966. THIS ALSO BREAKS THE MONTHLY RECORD SET IN 1966 AND 1994, MAKING TODAY THE HOTTEST JUNE DAY ON RECORD AT THIS SITE. THIS PRODUCT WILL BE UPDATED SHOULD TEMPERATURES CONTINUE TO RISE. RECORDS FOR THE ISLIP NY AREA GO BACK TO 1963. ALL CLIMATE DATA ARE CONSIDERED PRELIMINARY UNTIL REVIEWED BY THE NATIONAL CENTERS FOR ENVIRONMENTAL INFORMATION (NCEI).

Lefferts/ South Ozone Park now 103°.

Pretty wild to see MTP hit 97°. Weather conditions for: Montauk, Montauk Airport, NY (ASOS/AWOS - OKX) Elev: 7.0 ft; Lat/Lon: 41.07306/-71.92333 Get Yearly Precip Total (non QA/QC'd data) Get Water Year Precip Total (non QA/QC'd data): For selected observations near this location: click here Date/Time (L) Temp. (°F) Dew Point (°F) Relative Humidity (%) Heat Index (°F) Wind Direction Wind Speed (mph) Sea Level Pressure (mb) Station Pressure (in Hg) Altimeter Setting (in Hg) 6 Hr Max (°F) 6 Hr Min (°F) 24 Hr Max (°F) 24 Hr Min (°F) Jun 24, 1:54 pm 97 72 45 106 W 6 1017.30 30.03 30.04 97 82

Corona, Newark, and Harrison now at 102°.

100° now a few blocks east of the ASOS on 75th street on the ENSO west network. With several 100°+ readings just outside the Park on Wunderground.

JFK at 101° now. RECORD EVENT REPORT NATIONAL WEATHER SERVICE NEW YORK, NY 1233 PM EDT TUE JUN 24 2025 ...RECORD DAILY AND MONTHLY HIGH TEMPERATURE SET AT JOHN F. KENNEDY AIRPORT... THE HIGH TEMPERATURE REACHED 101 DEGREES SO FAR TODAY AT JOHN F. KENNEDY AIRPORT. THIS BREAKS THE OLD DAILY RECORD OF 97 DEGREES, SET IN 2010. THIS ALSO BREAKS THE MONTHLY RECORD OF 99 SET IN 1949, 1952, 1959 AND 1964, MAKING TODAY THE HOTTEST JUNE DAY ON RECORD AT THIS SITE. THIS PRODUCT WILL BE UPDATED THIS AFTERNOON SHOULD TEMPERATURES CONTINUE TO RISE. RECORDS GO BACK TO THE YEAR 1948 AT THIS CLIMATE STATION. ALL CLIMATE DATA ARE CONSIDERED PRELIMINARY UNTIL REVIEWED BY THE NATIONAL CENTERS FOR ENVIRONMENTAL INFORMATION (NCEI).

The mesonet sites had to find spots which would allow weather stations to be set up. There is a park on the south side of Merrick road at the Wantagh site which had the open land. Plus it’s right next to the old Wantagh COOP which registered the 107° reading back in 2010.

Yeah, this is how Mineola and Wantagh got to 108° and 107° back in July 2010. Downslope flow off the moraine which created compressional warming just on the Inland side of the sea breeze front. The zone this afternoon where the downslope meets the sea breeze will probably go 102° to 104° with maybe a 105° max in the warmest spots from Queens and Brooklyn into Nassau. Monthly Data for July 2010 for New York Click column heading to sort ascending, click again to sort descending. MINEOLA COOP 108 WANTAGH CEDAR CREEK COOP 107 LAGUARDIA AIRPORT WBAN 103 NY CITY CENTRAL PARK WBAN 103 WEST POINT COOP 103 RHINEBECK 4SE COOP 103 SHIRLEY BROOKHAVEN AIRPORT WBAN 103 New York-LGA Area ThreadEx 103 New York-Central Park Area ThreadEx 103 FARMINGDALE REPUBLIC AP WBAN 102 DOBBS FERRY-ARDSLEY COOP 102 POUGHKEEPSIE/HUDSON VALLEY REGIONAL AIRPORT WBAN 102 WESTCHESTER CO AP WBAN 102 Poughkeepsie Area ThreadEx 102 STONYKILL NEW YORK RAWS 102 ISLIP-LI MACARTHUR AP WBAN 101 ROSENDALE 2 E COOP 101 BLOOMINGBURG 2 SW COOP 101 JFK INTERNATIONAL AIRPORT WBAN 101

I am hoping they can manage the power demands on the system later to avoid anything more than some scattered outages or brown outs. Running 24hrs uninterrupted with the heat index over 90° is impressive. So usage should really spike this afternoon.