Late June 2025 Heat Wave

[OrdIowPitMsp]

24 minutes ago, TheClimateChanger said:

There are probably more. Those are just the sites I checked. MSP was 82F overnight, but has since dropped lower due to thunderstorm activity.

Thunderstorms stayed south of the airport. I don’t think we dropped below 81. Feels like New Orleans out here.

[TheClimateChanger]

28 minutes ago, TheClimateChanger said:

There are probably more. Those are just the sites I checked. MSP was 82F overnight, but has since dropped lower due to thunderstorm activity.

Cedar Rapids, Iowa (78F) will also be a new monthly record high minimum if it holds.

[cyclone77]

Back home now.  This air mass is a true slap in the face.  A big wet slap in the face lol.  

[SolidIcewx]

Going on 1130 and already have to change shirts at work. Going to be a fun few days. Can feel the air getting thicker as the morning goes on.

[OrdIowPitMsp]

From the NWS

 

The forecast low of 83 at MSP would be the second warmest low on
record, and 3 degrees short of the all-time record of 86 from
the Dust Bowl era. 

[TheClimateChanger]

13 minutes ago, OrdIowPitMsp said:

From the NWS

 

The forecast low of 83 at MSP would be the second warmest low on
record, and 3 degrees short of the all-time record of 86 from
the Dust Bowl era. 

Haven't looked elsewhere but it looks like MSP has at least tied the daily record. St. Cloud has set a new daily record.

[Spartman]

It begins today for some. Got the first 90 of the year here.

[TheClimateChanger]

8 hours ago, TheClimateChanger said:

Cedar Rapids, Iowa (78F) will also be a new monthly record high minimum if it holds.

Also, the low of 80F at Eau Claire, Wisconsin was 1F shy of both the June monthly record high minimum and the all-time record high minimum. La Crosse, Wisconsin was 1F shy of the monthly & 2F below the all-time record.

Possibility that one or both gets set or tied tonight/tomorrow if the winds stay up enough. Also would need to stand through midnight local time. Not sure if there’s a risk of convection there tomorrow.

[michsnowfreak]

On 6/20/2025 at 4:51 PM, michsnowfreak said:

Tomorrow will be the first 90 of the year for DTW. The avg first is June 10th.

DTW did hit 92 but Detroit City and Mt Clemens only hit 89. I suspect I only hit 88-89 on the east side by the water. A bit underwhelming for day 1 but the main heat should be tomorrow thru Tuesday.

[cyclone77]

Temps underachieved here today with only 93.  Only 93 at MLI as well.  Mid 70s dews pushed the index over 105 though.

Our hottest temp so far remains the 95 back on May 15th, although that was with much lower humidity.

[nwohweather]

91 today. Pretty impressive heat wave considering how cool it's been

[nvck]

cvg record high for jun 23/24 is 94, which i'm fairly certain will get broken, probably for both days.

[Torchageddon]

The start of the heat wave here busted; only got to 27 instead of 30C, my current temp is 25C but some showing it rising mid-evening and staying around 27C til early morning. They lowered (WUN) tomorrow's high from 34 to 31C, what a gas!  That heavy rain and storm mid-day cooled things but I feel the sultry with the vital breeze.

[OrdIowPitMsp]

96 today. Forecast was 98 so I guess a bust low. Still 91 at 9:30pm

 

Both MSP and STC hit record high temperatures on Saturday, June
21, breaking the previous records of 95 set in 1910. The exact
values for each are still being verified, but they reached at
least 96. Record high temperatures are possible again on Sunday
with hot/humid air in place and the warm front remaining to the
north of our coverage area.

*** Record Highs Sun June 22 ***
Location | Forecast | Record
------------------------------
   MSP   |    97    | 98 (1911)
   STC   |    95    | 98 (1911)
   EAU   |    95    | 99 (1995)

 

[Torchageddon]

This is historic, my low was 25C/77F! I didn't think we would pull that off (I gave it 10% of verifying), extremely rare but the historic part is it was rising in the overnight period to 26C/79F before going back to 25. I'm getting different humidex readings but my station seems the most realistic at 30C at 6:30 am. Other stations around me confirmed 26C, among the warmest in Bruce-Grey. Northern Owen Sound around the bay had 27C/81F. Perfect conditions to achieve this - overcast overnight, breezy to mix things, and very humid. Captivatingly WUN is showing another low of 25C tomorrow - never seen back to back.

[TheClimateChanger]

9 hours ago, OrdIowPitMsp said:

96 today. Forecast was 98 so I guess a bust low. Still 91 at 9:30pm

 

Both MSP and STC hit record high temperatures on Saturday, June
21, breaking the previous records of 95 set in 1910. The exact
values for each are still being verified, but they reached at
least 96. Record high temperatures are possible again on Sunday
with hot/humid air in place and the warm front remaining to the
north of our coverage area.

*** Record Highs Sun June 22 ***
Location | Forecast | Record
------------------------------
   MSP   |    97    | 98 (1911)
   STC   |    95    | 98 (1911)
   EAU   |    95    | 99 (1995)

 

Looks like the low so far has been 82F at Minneapolis (MSP), which is a daily record high minimum but 1F shy of the all-time monthly record in the threaded history. I do feel like there were periods in some of these recent years where MSP (and many of the larger airports) would be several degrees above surrounding observations. But they've been running much more in line with other observations, so no 84F or 85F in the cards today. Seems like they eliminated a lot of that so-called "urban heat island" effect. Don't expect these airports to pop a 100F in this heat wave when every other observation is 95-99F. It's going to need to be near 100F areawide (like 98-101F) to see a 100F observation. They've got these ASOS readings finetuned to a harder mode now. Either way, still setting a lot of records out there.

[OrdIowPitMsp]

2 minutes ago, TheClimateChanger said:

Looks like the low so far has been 82F at Minneapolis (MSP), which is a daily record high minimum but 1F shy of the all-time monthly record in the threaded history. I do feel like there were periods in some of these recent years where MSP (and many of the larger airports) would be several degrees above surrounding observations. But they've been running much more in line with other observations, so no 84F or 85F in the cards today. Seems like they eliminated a lot of that so-called "urban heat island" effect. Don't expect these airports to pop a 100F in this heat wave when every other observation is 95-99F. It's going to need to be near 100F areawide (like 98-101F) to see a 100F observation. They've got these ASOS readings finetuned to a harder mode now. Either way, still setting a lot of records out there.

When we were still at 90 at midnight I thought there was a chance of breaking some records. Madison Minnesota is usually the warmest city in the Twin Cities WFO. Low of 86 there. 

[michsnowfreak]

The low of 78 at Detroit breaks the daily record and is the warmest low since July 5, 2018. The all-time warmest min for Detroit, set 5 times, is 80.

[TheClimateChanger]

34 minutes ago, OrdIowPitMsp said:

When we were still at 90 at midnight I thought there was a chance of breaking some records. Madison Minnesota is usually the warmest city in the Twin Cities WFO. Low of 86 there. 

Wow, that's crazy. That would be very near the State record high minimum for the month of June if legit. Won't count though since it looks like an AWOS site.

Looks like the highest is 87F at Canby from 6/29/1931. The 87F from St. Peter on June 30, 1921 is clearly wrong. The next closest low in the State that day was 75F in downtown Minneapolis (see below); however, the 87F from the 1931 heat wave looks reasonably legit. Below are ALL observations of a minimum of 83F or higher in the month of June. The 86s from 1890, 1942 & 1996 all look incorrect as well. While data from 1890 is limited, the second hottest was 73F at Saint Paul downtown, and it shows a ridiculous 4F diurnal range way out of line of the other observations.

June 30, 1921 - just showing the hottest sites here:

June 27, 1890 - all data:

[SolidIcewx]

15 minutes ago, michsnowfreak said:

The low of 78 at Detroit breaks the daily record and is the warmest low since July 5, 2018. The all-time warmest min for Detroit, set 5 times, is 80.

I had to explain to the lady at home on why the ac would stay on even if set higher. It was really toasty last night

[cyclone77]

Got down to a relatively frosty 75 here.

[TheClimateChanger]

Looking at some lows this morning.  New monthly record high at Saint Cloud, Minnesota (80F). Minneapolis-St. Paul, Rochester, and Brainerd all fell one shy of the monthly record, but each set daily records. 

Wisconsin put up some insane numbers. These are all ThreadEx sites with long PORs. All subject to being maintained through midnight local standard time, which should be the case barring something unexpected.

Hayward had a low of 80F, obliterating the prior monthly record of 75F by an insane 5F. The old record was last set on June 23, 2005. Also sets a new all-time record high minimum temperature.

La Crosse had a low of 80F, tying the monthly record set on June 29, 1931.

Green Bay had a low of 79F, breaking the monthly record of 78F last set on June 30, 1931. It also ties the all-time record high minimum temperature.

Wausaw had a low of 78F, breaking the monthly record of 77F set on June 28, 1931. This was 1F below the all-time record of 79, set in 1999.

Rhinelander had a low of 76F, breaking the monthly record of 75F set on June 27, 1991, and tying the all-time record high minimum temperature.

[Chicago Storm]

Peaked at 94° at ORD and 95° at MDW yesterday.

ORD had a low temp of 78° yesterday, which broke the record high min temp for the date of 74°(1923).

ORD also had a low temp of ‘only’ 80° this morning, which puts things on track to break the record high min temp for today’s date as well.

[TheClimateChanger]

2 hours ago, SolidIcewx said:

I had to explain to the lady at home on why the ac would stay on even if set higher. It was really toasty last night

Wow! I didn't even realize it was that hot in Michigan.

The low of 80F at Saginaw breaks the all-time record high minimum temperature there by 2F. The old record of 78F was set on July 1, 1931 & August 1, 2006. The old monthly record of 77F was last set on June 30, 2018.

The low of 79F at Flint breaks the monthly record high set on June 20, 1953 by 1F, and ties the all-time record high minimum of 79F, set on July 18, 1942.

Lansing Area, with records dating to 1863, also set a new monthly record high minimum and tied the all-time record minimum of 78F. The prior June record of 77F was last set on June 30, 2018. The all-time record of 78F was set previously on July 18, 1942 & August 1, 2006.

The low of 80F at Holland, ties the June monthly high last set on June 15, 2022.

The low of 77F at Houghton Lake set a new monthly record high. The old record was 75, set on June 30, 2018.

The low of 78F at Detroit was one shy of the monthly record in the threaded history. It was 79F on June 25, 1952, when observations were taken at City Airport. Incidentally, it matched that reading at City Airport this morning. The all-time record is 80F, set 4 times in July and once in August, with the most recent occurrence being August 1, 2006.

 

[OrdIowPitMsp]

It’s a kiddie pool and splash pad kind of day. These are the good old days.