Below zero...here???!!!

The temperature this a.m. actually dropped to -2 (F) at the local airport! At the moment we're colder than Roanoke, as we are at 0 degrees and the airport there is at 4 degrees. The difference seems to be that we have been under totally clear skies all night while the areas southwest of here have been topped by a thin layer of high cirrus clouds which held in the "heat" and kept the bottom from dropping out of the thermometer. The longer range models do indicate that the upcoming week will be more seasonal with high temperatures reaching the 40's by Thursday. How cold is it when the 40's sounds warm....?