UPDATE, 5 p.m.: The mercury at BWI-Marshall Airport touched 86 degrees at 5 p.m. Monday, establishing a new record high for the date. The previous record for an April 4 in Baltimore was 83 degrees. It had stood for 55 years, since 1956.
This is the second time this year the thermometer has topped 80 degrees at the airport. The first was on March 18, with a high of 81, also a record for the date.
The 1956 record of 83 degrees was the lowest daily record high for April. The lowest record high now is 84 degrees, set on April 5, last year.
Washington's Reagan National Airport reported a high of 85 degrees, tying the record set there in 1956. Dulles International reported 84 degrees, breaking the 81-degree mark set on this date in 1999.
This is the warmest weather Baltimoreans have seen since an 91-degree reading on Sept. 25, 2010. Perfect weather for Opening Day.
The graph above is for The Sun's weather station, not BWI. We reached 85.6 degrees at 4:50 p.m., after a climb from 46.9 degrees at 5:20 a.m., a gain of 38.7 degrees.
By the way, the NWS is predicting rain and snow showers behind the cold front early Tuesday morning for the high ridges of the Maryland mountains. Really.
Here are some other 5 p.m. readings from around the region:
Maryland Science Center, Baltimore: 87.1 degrees
Andrews AFB: 84.7 degrees
Patuxent River NAS: 84 degrees
Dulles International Airport: 84 degrees
Reagan National Airport: 84 degrees
Frederick: 82.0 degrees
Hagerstown: 80.1 degrees
Annapolis: 75 degrees
Martin State Airport: 73 degrees
Petersburg, Va., reported a reading of 90 degrees shortly after 5 p.m.