Bill, I see that you understand Texas weather too. I've seen people planting tomatoes as early as late February here, and I've watched others lose tomato plants May 2 to frost and freeze.
Temperature averages are just that. It means they take in data that some years the low for that day is 15F and another year it is 64F. It is an average taken from many years of figures. Tropical and arctic temps are easier to rely on.
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