It is generally accepted that a frost can occur at a instrument level temperature reading of 38 degrees fahrenheit. And a freeze happens at an instrument level temperature of 32 degrees fahrenheit.
Here is how it all breaks down (using Wichita Falls official recording station at the airport and SAFB):
Earliest recorded first frost: September 21, 1983 @ 38 degrees.
Earliest recorded freeze: October 9, 2000 @ 31 degrees.
Normal first frost: November 20.
Normal first freeze: December 10.
KFDX Meteorologist Bryan Rupp
Copyright 2015 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.