This post has been updated.
Reagan National peaked at 67 degrees, which is well above average for the date but still on the cool side compared to its neighbors. The south wind, which is bringing warm air north, is also blowing across the Potomac River, which tends to cool the airport. National’s record high for the date is another long-standing one: 70 degrees set in 1931.
Records for Dec. 14 (Monday)
National — 70 degrees (1931)
Dulles — 67 degrees (2001) broken at 1:24 p.m.
BWI — 71 degrees (1929)
National — 47 degrees
Dulles — 46 degrees
BWI — 46 degrees
In Salisbury, Md., the temperature soared to an impressive 72 degrees at 11 a.m., which broke the 97-year old record of 71 set in 1918.
Today’s unseasonable warmth follows a trio of record highs broken on Sunday. National registered 71 degrees on Sunday, tying the record originally set in 1889 (set at 24th and M St., the previous weather station for the District). Dulles surged to 73 degrees, breaking the record of 71 from 1984. BWI hit 72 degrees, passing the record of 69 from 1889 (at a different location).
On Saturday, BWI tied its record high of 71 degrees, previously set in 1979.
Temperature records at National and BWI go back to 1872, though both locations changed the site of the sensor once. Records at Dulles go back to 1963.
The warmth is surging north ahead of a strong trough of low pressure that will bring a high chance of rain today, and only slightly cooler temperatures starting Tuesday. As this trough digs east across the Central U.S., it’s pumping up warm air from the south out ahead of the cold front. Temperatures have been riding well above average since late last week in the eastern U.S.
The cold front will pass through the Mid-Atlantic on Monday evening, bumping temperatures down a bit, but highs are still expected to reach the low 60s across much of the D.C. area on Tuesday.