Wednesday, September 22, 2010

Endless Summer VII: Heat Parade Rolls On;
64th Day of 90°+ Temperatures in Washington

5:30 PM Update: The preliminary high temperature is 95°, just 3° below the daily record and 18° above the average for the date. With the low of 67°, the day is 13° above the climatological average.

Other regional high/low temperatures:
Washington Dulles  94/63
Baltimore/BWI 91/61
Baltimore Downtown 93/65
The high at Dulles ties the record set in 1970 and 1980.

Original post:
By 3 pm today, the temperature at Washington reached 91°, making this the 64th day of 90° or higher temperatures this year. The high so far today is the 93° reading at 4 pm.

Day 64 was achieved 2 days later than in 1980, but that year peaked out at the record annual total of 67 days on September 23. With 90° temperatures expected for the next 2 days, however, this year's heat streak is likely to go at least 1 day later. This year has already far exceeded 1980's 90° record in longevity; the first 90° day in 1980 was May 13, but this year it was almost a month earlier, on April 16.

Meanwhile, the 94° so far at Richmond and 95° at Raleigh have further extended their already broken records. This is now the 7th day of 90°+ temperatures at Raleigh out of the last 9 and the 13th in September overall. It's the 8th day this month at Richmond.

Images (click to enlarge): Cumulative annual number of days with temperatures 90° or higher in Washington, CapitalClimate chart from National Weather Service data; U.S. surface temperatures at 4 pm EDT, September 22, 2010, from Unisys

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