TimB

On 6/28/2025 at 1:39 PM, TheClimateChanger said:

Made it down to 69F before midnight standard time, which was also today’s low. Although only at 9 in a row, I’m interested in seeing how many 80+ days we string together. Seemingly no end in sight, though. Strung together 37 in a row in 2020.

Appears the 80+ streak may already be in jeopardy. Not ruling it out yet.

Yesterday was the 9th consecutive day the temperature at PIT didn’t drop below 69. That’s the longest streak on record at the airport. Could add another day to that today, depending on what the temp is at 1am.

1 hour ago, TheClimateChanger said:

Up to 72.9F on the month at PIT for the mean temperature, matching 1994 as the highest in June since 1967 (73.0F) and surpassing last year’s final average by 0.1F. Pretty impressive turnaround considering the cold start to the month - we had accumulated an aggregate deficit of 22F from the normal value in just the first 2 days of the month.

I assume today’s average should be enough to allow us to jump past 1994 and 1967 to be the hottest June recorded at Pittsburgh International?

Assuming this morning’s low of 71 holds, it’ll be the 15th time on record that Pittsburgh hasn’t gone below 71 for at least 6 consecutive mornings, the first since August 13-18, 1995 (which is the only other time that’s happened since observations moved to PIT airport in 1952, and the first time it’s ever happened in June.

Edit 10:20 pm: alas, it wasn’t to be. The storms killed it and dropped us below 71 this evening.

1 hour ago, ChescoWx said:

Rainfall amounts were pretty variable last night across Chester County. We saw as much as 2.35" at Nottingham and 2.17" at Atglen to as little as 0.17" at Devault. It’s much cooler today with temperatures in the low 70's. Across the higher spots of the County we may not see another 90-degree reading until the middle of July. Rain chances to ramp up a bit again tonight and again on Saturday night. We warm up to the upper 80's on Sunday before we see temperatures near normal in the mid 80's for much of the next week.

I’ll post your daily summaries for the 3 days you weren’t here:

Monday: high 92.1, low 75.7 (+10)

Tuesday: high 93.1, low 76.6 (+11)

Wednesday: high 91.6, low 73.4 (+9)

2 hours ago, TheClimateChanger said:

Another 90 in the bag… 5 straight. That is the longest since an 8-day stretch ending July 10, 2020.

We also had 5 day stretches in both July and August last summer, which I know doesn’t technically negate your statement.

The only other time we had 5 day streaks of 90 degree temps in 3 consecutive summer months (not necessarily the same summer) was July and August of 1887 and June of 1888.

If this morning’s low of 74 holds, it’ll be the first time Pittsburgh International hasn’t dropped below 74 for three consecutive days, and the first in the threaded record since 1930. 

First time since 1885, 1887 and 1888 that Pittsburgh has gotten to 94 in 3 out of 4 consecutive Junes.

Already have a 90 on the board at PIT. Two degrees above yesterday at the same time, with a dewpoint two degrees lower. I’d say 95 might be in play.

NWS point and click centered at KPIT has lows at or above 70 every day through Monday. If that happens (I’ll bet it doesn’t), it’ll be the 7th occurrence on record of 9+ consecutive days with lows of 70+, first time at Pittsburgh International, first time since 1918, and the first time in June. Record is 12 in 1916.

Remembering last June’s heatwave, I seem to recall there was an afternoon or two that we got some nice outflow that made things feel quite pleasant in the late afternoon, even in areas that didn’t get storms. 

32 minutes ago, TheClimateChanger said:

Even if it only gets to 92-94F, if dewpoints reach into the mid 70s, that's impressive and rare. Peak heat indices could approach hourly records for the month of June, potentially on multiple days. The highest hourly heat index reading in June (dating back to 1945) is 106F at 2 pm on June 27, 1978. More recently, a bunch of overnight and morning hourly record high heat indices were set on June 29, 2012. Even more recently, a couple of late evening record values were tied on June 15, 2022.

Not a forecast but just providing some context. Lots of "it's just summer" comments again on X, as though these values are commonplace every summer. Also, lots of comments complaining about the "heat index" as if it was just invented yesterday and hasn't been a thing since the 1970s. And, before that, they had the "Temperature-Humidity Index" in the 1950s to 1970s.

Here's what KDKA is showing. Not saying it's correct, but if it's in the ballpark, this is "not just summer" IMO. The combination of heat and humidity would approach or exceed records from the last eight decades on multiple days. In July and August, not quite as big a deal. But this is not something you see every June, even if we did have a similar stretch last year [albeit with generally lower dewpoints]. Maybe the temperatures and/or dewpoints are being overestimated by the models and forecasts. That would be like saying multiple days in a row in late December with -20F or lower windchills is "just winter" in Pittsburgh.

 

In other words, excessive/extreme heat warning criteria have only ever been observed for two hours in Pittsburgh in June, on that day in 1978?

If PIT does get to 94 during this heat wave, it’ll be the first time since 1952-1953 that we’ve done it in back to back Junes, and the first time since the questionable records of the 1870s-1880s that we’ve done it 3 out of 4.

3 minutes ago, ChescoWx said:

Spin away TimB - spin away - LOL!!

You learned something new today. You’re welcome.

1 minute ago, ChescoWx said:

Not my data - KMQS Airport data from the NWS....

Yes, I realized that after I posted. Anyway, as @TheClimateChangercan tell you, asos ran warm in the 80s/90s and that almost entirely explains the KMQS thing.

5 minutes ago, ChescoWx said:

Thank God I pay for the most expensive station that has fan aspiration to correct for solar errors of surrounding stations!!

okie dokie

45 minutes ago, ChescoWx said:

That is simpy an equal chance outlook... far from a forecast. The extended Euro and GFS models paint a normal to below month - not saying there won't be a warmer week in the mix.

We’ll see how the averages stack up for June. I’ll bet every major observing site in Pennsylvania is above normal when it all shakes out.

26 minutes ago, ChescoWx said:

The warmest temperature across the county yesterday was, of course, at the Brandywine Airport in West Chester at 86.0 degrees. Most spots saw temperatures between 81 and 84 yesterday. Today should be a degree or two warmer and will be the warmest day for a while. The pattern turns a bit unsettled later tomorrow and through the weekend. Not a washout at all but some showers are most likely on Saturday. Shower chances appear to increase again by next Tuesday. Our relatively wet pattern looks to continue with no foreseeable heat in our future. In fact most models show near normal to slightly below average temperatures through the 4th of July.

 

 

Re: your last statement:

In before East Nantmeal shows up and says he didn’t hit 80 yesterday.

7 hours ago, TheClimateChanger said:

Chilly day today. Looks like the high might end up at 57F. Not a record, however. It was a frigid 45F for a high on this date in 1910.

18th year on record with a high of 57 or lower on 5/31 or later. So it’s about a once a decade event. Last was 56 on 6/1/2015.

Pretty impressive cold advection today, for temps to slowly fall through the 50s despite precip ending and a few peeks of sun just three weeks from the solstice.

28 minutes ago, TheClimateChanger said:

Looks like we will eek below normal for the month tomorrow (on the last day of the month).

Yeah, looking like a -0.1, maybe a -0.2 depending how cold we get by 1am Sunday.

Important to note that May has warmed tremendously in recent years and this month would have been decisively above normal according to the 1981-2010 normals.

On 5/27/2025 at 5:57 PM, Ahoff said:

The warmth for the month has been wiped out.  We should end below normal for May.

A shame that we’re going to back into a below normal month after such a warm start. Really thought we’d get 23 out of 24 for the 2 year period starting July 2023. 

If this morning’s low of 69 holds, it’ll be a daily record warm min. Only once has a low of 69 or higher been recorded at PIT on or before May 16th, though there are a handful of other instances in the threaded record.

Who’s ready for days and days of cut-off low misery?