It will be another frigid night before the blast of arctic air gives way to warmer weather.
Forecasters predict temperatures overnight to drop into the 20s in parts of Hernando and Pasco counties and the 30s in Hillsborough and Pinellas counties.
"It's going to be cold,'' said Mike Clay, chief meteorologist with Bay News 9.
The low temperatures recorded overnight Monday were Brooksville, 30; Zephyrhills, 32; Inverness, 30; Tampa, 33; Clearwater, 35; and St. Petersburg: 38 degrees
Those temperatures were cold enough to prompt the opening of more than a dozen cold-weather shelters, but not enough to break any records.
The high temperature during the day Tuesday is not expected to climb out of the 40s, which would break a century-old record for the date, 50 degrees, set in 1892.
The cold is much worse elsewhere. Much of the Midwest and Northeast are seeing some of the coldest temperatures in decades.
And the frigid weather has imperiled scores of travelers. Wind-chills dipping below -40 degrees meant some airport workers around the country could only remain outside for minutes. JetBlue airways stopped all scheduled flights to and from New York and Boston.
Tampa International Airport wasn't immune. It reported 25 canceled and 44 delayed flights as of 10 a.m. Tuesday.
The good news is that a warming trend will begin Wednesday, with highs in the Tampa Bay area climbing into the 60's.
"It's going to be a rapid warmup,'' said Clay. "This was one of those quick shots of cold air, and then it's gone.''