Preliminary temperature readings show the mercury bottomed out at 53 degrees Friday morning at Baltimore-Washington International Thurgood Marshall Airport, a level that, if confirmed, would be Baltimore's coldest ever for Aug. 16 and chilliest for August since 2004.
The National Weather Service said it's too early to call it a record for sure -- the day's data won't be checked for accuracy until 1 a.m. Saturday, and sometimes false readings can be discovered, said weather service meteorologist Kevin Witt.
But it is almost certainly one of the coolest August morning in years, Witt said.
The coldest Aug. 16 on record in Baltimore came in 1979, with a low of 54 degrees. The lowest ever recorded here in August was 45 degrees, on Aug. 30, 1986.
It has been nearly a decade since BWI hit 53 degrees in August. The last time was Aug. 7, 2004, Witt said. One day each in August 2003 and August 2000 also hit 53 or colder, he said.
Cool temperatures are forecast to stick around through the weekend, but could climb back to more seasonable levels with highs in the mid- to upper-80s by early next week.