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Last fall I saw it sleet in Minneapolis for like 3 minutes. This was mid-October and the temp was 43 degrees. It had been snowing in the 30s the day before.
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Originally Posted by Shalop
Highest temp I've seen snow is about 5C. I've seen graupel as high as 8C though.
Similar here. 42° was my warmest. I've seen reports and proof of temps in upper 40s with snow starting to fall.
Problem is it will never stay all snow OR the temp will drop. So you can't have both for a long period. The snow in the air will drop the air temp as its falling. So can start at +10C but quickly drop to 2C and keep snowing.
The warmest snow I've personally seen here was 44 F/ 6 C and it was very wet snow with large flakes. It only snowed like that for a short time then turned to a rain/snow mix as it warmed up then finally turned into a heavy rain after the temperature reached 47 F/ 8 C.
I've seen snow at about 7C/45F- in April years ago on a day of "sunshine and showers". It (snow above about 3C) seems to mainly happen on these kind of days in spring. As I understand it there was air at 850hpa cold enough to produce snow, the layer immediately above the ground was so warm because the sun is much stronger in the day at that time of year, but the dew point was 0C or lower all the way down and there was never a big enough dry layer to evaporate it (that's an obstacle to warm snow: low dewpoints and high temps equal humidity too low for precipitation in most cases).
On the other hand in winter I've seen 850hpa temps as low as -7C or so produce cold rain at 1-3C with dewpoints of 0C. While at other times it's been settling snow with -3C 850hpa temps and the same temp/dp when it started.
I’ve seen accumulating snow here with temps in the upper 30’s F (3-5 C). Granted, it does get colder as the snow progresses and at night we are well below freezing.
Here we had snow with temperature close to 5⁰C in the middle of the afternoon in July 2021. It was not accumulating but we could clearly see the snow flakes falling. Later at night there was more snow with temperature around 1-2⁰C, with some accumulation. Then the temperature stayed a bit below zero during the rest of the night and in the next morning there still was snow in the grounds, quickly melting.
Winters are mild here. The temperature rarely goes below zero and when it happens normally the air is dry. So that are usually the conditions when we have snow here, with temperatures above zero. But of course it still needs to be cold. Snow with 5⁰C is possible, but I doubt it would happen with temperature closer to 10⁰C and above.
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