A year ago at this time – the thick of summer – D.C. was mired in its longest streak of consecutive hours above 80 on record, 138 to be exact.  One year after that run of sultry nights failing to fall below 80 in parts of the region, we have 50s and 60s.

The mercury briefly settled at 55 degrees at Dulles Airport early this morning, matching the record low temperature for the date from 1976.  Dulles’ records date back to 1963.

Away from Dulles, readings across the region were extremely refreshing, but for the most part above record-setting levels.

Reagan National dropped to 66, 10 degrees above the record of 56 from 1929 (set at 24th and M St, the prior observing station for Washington).  BWI dipped to 61, three of the record of 58 from 1987.

Clear skies, light winds and the remnant polar airmass will favor a second straight night of temperatures roughly 5-10 degrees below average (the averages are 71, 66, and 67 at Reagan National, Dulles, and BWI, respectively).

BWI has a legitimate shot a tying or besting Friday’s record low of 58 from 1976, with lows forecast in the 56-59 range there.  Reagan National and Dulles should remain safely above their records of 55 (from 1892) and 51 (from 1985) given forecast lows around 62-65 and 55-58, respectively.

Overnight temperatures start to trend upwards this weekend, but mercifully no signs of stifling 80-degree nights.