Worth knowing: these thresholds assume an established, reasonably strong colony. A small nuc, a fresh split or a spring colony still building up will feel cold and wind more sharply. Go gentler and keep it briefer with anything that hasn't built up its numbers yet.
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Handy for checking an out-apiary before you drive over.
Set your own conditions
Handy for checking tomorrow's forecast, or a site without a live reading.