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Location: East of Seattle since 1992, 615' Elevation, Zone 8b - originally from SF Bay Area
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It's snowing here now, at 33F, and I have see it snow at 36, but not above that. The important thing is the temperature higher up where the clouds are, if it's not too much above freezing down on the earth surface, it can snow, but will not stick.
Probably about 50 F / 10 C, but that would be a very once in a lifetime thing. Warmest snow I've ever seen where I live is about 41 F / 5 C. I've also seen it rain, not freezing - while I drove - at 31.8 F / -0.1 C.
With heavy precipitations and absence of foehn or bora winds, here it may snow even at 5°C, with the temperature reaching 1-2°C in a few hours. If precipitations are weak, at the same temperature we have only rain.
The world record is 15,5°C in Southern Texas in 1929.
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