This map shows the average annual low temperature (in zones divided by 10 degrees F). It's designed for plants but should give you a good idea of where it reach

This map shows the average annual low temperature (in zones divided by 10 degrees F). It's designed for plants but should give you a good idea of where it reaches freezing temperature (like, all of Florida until you get to Palm Bay or Tampa but only on the coast, for example; and all of Texas except the tip by Brownsville, and the coast by Corpus Christi). https://planthardiness.ars.usda.gov/ https://planthardiness.ars.usda.gov/