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Hottest July/Month on Record in DC


MN Transplant

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Not really a question at this point.

Prior top 10 Julys:

1991 81.4

1995 81.5

1994 81.8

1988 81.9

1955 82.1

1980 82.3

1987 82.6

1999 83.0

1993 83.1

2010 83.1

Through the 27th, DCA stands at 83.8. Using this morning's low, and NWS point and click results in a July temp of 84.2. GFS MOS would be lower (83.9), but the low temperatures are unreasonable. Either way, an amazing July, besting last year handily.

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Should also be the hottest month nationally :arrowhead:

Should be close. Only thing that might prevent it is the cool temps in the far West, which July 1936 didn't have. The area of extreme anomalies (+6 and higher) is also smaller this month.

Are IAD, BWI and other area stations also going to set the record?

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Should be close. Only thing that might prevent it is the cool temps in the far West, which July 1936 didn't have. The area of extreme anomalies (+6 and higher) is also smaller this month.

Are IAD, BWI and other area stations also going to set the record?

BWI is currently 81.3 and the record is 81.5. BWI will probably tie or set a new record.

IAD is currently 80.4 and the record is 79.4. IAD will certainly set the record.

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Should be close. Only thing that might prevent it is the cool temps in the far West, which July 1936 didn't have. The area of extreme anomalies (+6 and higher) is also smaller this month.

Are IAD, BWI and other area stations also going to set the record?

1936 had such an absurd area of anomalies in the Upper Plains. The area of +2 is probably slightly larger this year, though. Hard to really tell, but I'd just guess that '36 will remain, and '11 will duke it out with '06 for 2nd.

post-1746-0-63470900-1311869990.png

post-1746-0-01269400-1311869948.png

post-1746-0-66510400-1311869927.png

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Love the chart on the right. I long for the early 2000s Julys.

Not sure the attached column option was the best one to use on the left.

I guess I don't know design. It looks like a scrabble board or something. :scooter:

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Why did the NWS describe it as "interesting" that Baltimore had its hottest month on record but overnight lows were only 24th warmest on record for the month? It shouldn't be too surprising considering the records were taken downtown on the roof of the Customs House until 1950. So a lot of the minimum temperatures records from that era were probably contaminated by UHI and artifically raised. Look at how much warmer it was at the Science Center than BWI (and that's not even a rooftop station, which Watts et al. have shown can raise temps by up to 10 degrees compared to ground-based readings). A better option would be to just look at max temps and I'm sure this month probably smashed the record there (it would have had to to display the pattern described, i.e. hottest mean temp but only 24th hottest low temp).

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here's more on July in D.C. -- some similar to earlier link from MN Transplant but Matt Rogers also goes into the specific reasons this yr that helped cause

http://www.washingto...8rOnI_blog.html

Nice write-up. One additional noteworthy fact: On July 23, 2011, the average temperature at DCA was 93.0 (102 high, 84 low), tying the all-time record high average for any day in DC history set on July 6, 1999 (103 high, 83 low).

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