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Pittsburgh, Pa Summer 2024 Thread.


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8 minutes ago, TimB said:

I believe that’s an error. I eliminated that day and there was a similar error on the day after as well. Highly unlikely it was in the 90s at 9am.

Yeah, it’s an error. I pulled up the climate data from July 1989 for KPIT and it has daily observations for each three hours starting at 1 am Local Standard Time (i.e. 2 am EDT) and it was 74F at 8 am, 89F at 11 am, and 93F at 1 pm. While the 9 am observation wasn’t listed, obviously wasn’t 93F. Looks like there was some weird time offset in the way the data got uploaded to the IEM database.

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6 minutes ago, TheClimateChanger said:

Yeah, it’s an error. I pulled up the climate data from July 1989 for KPIT and it has daily observations for each three hours starting at 1 am Local Standard Time (i.e. 2 am EDT) and it was 74F at 8 am, 89F at 11 am, and 93F at 1 pm. While the 9 am observation wasn’t listed, obviously wasn’t 93F. Looks like there was some weird time offset in the way the data got uploaded to the IEM database.

The 83F reading from 7 am on September 9, 1989 also appears to be erroneous. It was 69F at 5 & 8 on that date. And likewise the 83F from 6 am on June 23, 1989 also appears to be erroneous. Readings from 5 & 8 am were 67 and 66, respectively.

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1 minute ago, TheClimateChanger said:

The 83F reading from 7 am on September 9, 1989 also appears to be erroneous. It was 69F at 5 & 8 on that date. And likewise the 83F from 6 am on June 23, 1989 also appears to be erroneous. Readings from 5 & 8 am were 67 and 66, respectively.

Most likely, the actual highest temperature for those hours occurred in 2012, or perhaps this morning.

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12 minutes ago, TheClimateChanger said:

Most likely, the actual highest temperature for those hours occurred in 2012, or perhaps this morning.

6am was 81 on that date in 2012, 80 on 6/23/24, and 80 this morning.

7am was 80 in 2012, 80 on 6/23/24, and 81 this morning.

So we very likely tied the 7am record less than three weeks ago and broke it today (assuming the 82 at that hour on August 5, 1989 is as invalid as the other readings from that summer).

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3 minutes ago, TimB said:

6am was 81 on that date in 2012, 80 on 6/23/24, and 80 this morning.

7am was 80 in 2012, 80 on 6/23/24, and 81 this morning.

So we very likely tied the 7am record less than three weeks ago and broke it today (assuming the 82 at that hour on August 5, 1989 is as invalid as the other readings from that summer).

July 17, 1988 is also a candidate. It was 82F at 5 am and 8 am, 1F cooler than the observations from June 29, 2012 for those hours. I don’t have the hourly observations for 6, 7 or 9.

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2 minutes ago, TheClimateChanger said:

July 17, 1988 is also a candidate. It was 82F at 5 am and 8 am, 1F cooler than the observations from June 29, 2012 for those hours. I don’t have the hourly observations for 6, 7 or 9.

Regardless, we can say with 100% certainty that at least one hourly record (8am) and maybe others were set this morning.

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4 minutes ago, TheClimateChanger said:

July 17, 1988 is also a candidate. It was 82F at 5 am and 8 am, 1F cooler than the observations from June 29, 2012 for those hours. I don’t have the hourly observations for 6, 7 or 9.

*Correction: 1F below the observation from June 29, 2012, at 5 am, and 1F below the 8am observation today.

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1 hour ago, Ahoff said:

We’re making a run at 90.

Bit of a strange route to 90 at that. 5-min obs of 90 (probably 89) at 2:30, then down to 85 at 2:51, now back up to 89 or 90.

Edit: 90 is official on the daily climate report. Actually reached 91 after 5pm.

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In any event, today was the 10th day of 90+ for the summer.  Looks like the next 4 days will do better than 90F, which would put us at 14 90+ on July 16.

For the record, the 19th century summer data is absurd. Some of these years, the official summer mean temperature was warmer than D.C. Also, 1875-1900 averaged a ridiculous 29 days of 90+ in the official record. But 1901-1930 had an average of 9 days at the downtown site [which is even weirder when you consider most sites with PORs that long show that to be a warmer period, with hot summers in 1901, 1911, 1919, 1921, 1930]. The 1901-1930 average is actually one fewer than the current 1991-2020 mean.

image.png.49538fc57304456a9aacf475104cf6ee.png

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Up to 91 at PIT. That’s the 13th day of 91 or above so far this season, which is tied for the 6th highest total of 91+ days through today’s date behind only:

1. 1876 (19)

2. 1988 (18, only year at Pittsburgh International with more 91+ days on or before 7/15)

3. 1880 (18)

4. 1881 (15)

5. 1911 (14)

and tied with 1966 (13).

The magnitude of heat may not be extreme, but the number of days is up there with some of the hottest summers Pittsburgh has ever experienced.

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