Area shaded in light blue under freeze watch tonight (National Weather Service) Area shaded in light blue under freeze watch tonight (National Weather Service)

1:55 p.m. update: The freeze watch (issued yesterday) has been upgraded to a freeze warning across the region, effective 2-9 a.m. Thursday.

From 11:30 a.m.: Following rare mid-April snowflakes (a trace to 1 inch fell in the region, highest amounts in northern Baltimore County) last night, much of the Washington, D.C. metro region dropped near to below freezing this morning.  Two of our three local airports fell below 32, within a degree or two of record lows for the date.

Link: Rain and snow totals Tuesday from National Weather Service

Dulles Airport bottomed out at 30 degrees, just two degrees off the record low for the date, 28, set in 1981.  BWI’s low was 31, one degree above the record, 30, established in 1962.

Reagan National Airport, which recorded a low of 34, narrowly missed logging its latest last freeze since 1956.  It was 5 degrees above D.C.’s record low of 29 set in 1928 (at 24th and M St.).

Freeze watches are in effect tonight into Thursday morning as lows are forecast to again drop into the upper 20s and low 30s across the area.  Thursday’s record lows are a little colder than  today’s.  They are: 26 at Reagan National/D.C. (from 1875), 27 at Dulles (1983), and 26 at BWI (1962).  Of the three, only the record at Dulles has a legitimate chance to be challenged.

Related: Freeze warning: Factoring the frost odds for spring planting success