That’s the formula!
It’s less than perfect, but gives a good directional sense of how cold/for how long it needs to be to build ice. I used to just figure two weeks from after my part of the lake skimmed over (and held) and it was probably safe (defined by me as 7” or more of black ice at Cattle Landing). Typically that meant MLK weekend was the first available weekend to venture out. A bit late this year.
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