Well not totally. Right now in the Chattanoga area they are predicting 33 degrees sunday and monday night. Living on the Mt like I do it will probably hit 30-31. Glad I didn't plant early this year like I did last year.
Actually, temps could be considerably colder than just a degree or two below a city's low temperature. It is common for rural low temperatures to fall 5 to 8 degrees below a city low temperature due to the "heat island" effect of large cities.