Much of the region, particularly areas furthest from the Chesapeake Bay, dipped well into the 40s last night for the first time since May.
BWI Marshall Airport reached 49 degrees, a temperature last recorded there May 19.
Further out, the air was even colder. Garrett County was under a frost advisory until 9 a.m., with the county airport hitting a low of 43 degrees early this morning.
The Frederick Municipal Airport also hit 43 degrees, while just over the Mason-Dixon Line at the York Airport, the overnight low was 41 degrees.
But areas close to the still-warm waters of the bay were slightly less chilly.
Martin State Airport in Middle River reached 50 degrees and Phillips Army Air Field at Aberdeen Proving Ground reached 48. But on the Severn River at the U.S. Naval Academy in Annapolis, lows did not fall below 60 degrees.
Temperatures are expected to bounce back slightly, with highs closer to 80 and lows in the 60s for the next few days. But early next week, once fall has officially begun Saturday, another chill could bring temperatures in the 40s again.Copyright © 2015, The Baltimore Sun