Friday, September 3, 2010

Endless Summer II: Washington Adds to Record Pace of 90-Degree Streak

5:30 PM Update: The preliminary daily climate report shows the high/low as 91/77. All 3 days so far this month have been at least 10° above the long-term average. The low, if it holds through midnight, will be only 2° lower than the all-time September highest daily minimum set on this date in 1993.

Original post:Despite a high overcast from the far outer fringes of Hurricane Earl, the Washington temperature reached 90° at 4 pm today. This was the 60th day of 90° or higher temperatures at Washington in 2010, and it was achieved 6 days before the same number was reached in the record year of 1980. This puts 2010 in sole possession of second place for total 90° days in a year, behind the 67 of 1980. Today was the 6th consecutive day of 90° temperatures.

Following a cooler Labor Day weekend, 2 more 90°+ days are forecast by the middle of next week. The number of 90°+ days didn't reach 62 in 1980 until September 13. The remaining 5 days that year were September 14, 17, and 21-23.

Images (click to enlarge): Cumulative annual number of days 90° or higher, CapitalClimate chart from National Weather Service data; Visible satellite image of Hurricane Earl moving away from the Mid Atlantic coast, from

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