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Last night was 3.5'C and icy. The only explanation I can see for why the water keeps freezing at temps way above 0'C is that the bulb point must be below freezing and so as the water evaporates in the dry air, it cools down so much that it freezes, even though the air is far above freezing.
I don't know but I didn't expect any frost, that's the third night in a row with frost. We usually have our last frost end of April so I suppose it's not abnormal.
Last night was 3.5'C and icy. The only explanation I can see for why the water keeps freezing at temps way above 0'C is that the bulb point must be below freezing and so as the water evaporates in the dry air, it cools down so much that it freezes, even though the air is far above freezing.
Yep, that's a pretty plausible explanation. Another thing is that the surface often times is colder than the air temperature, meaning ice can form on windows, railings and whatnot at temps higher than freezing. I've seen frost on my window before with temps of 3-4 C.
How do they sustain agriculture with freezes in summer? That would be like 1814 and the year without a summer.
I don't know. Luckily it doesn't happen every year! I suppose when it does happen the time below zero is quite short and the next day likely sunny and pleasant. Here's the hourly data for Edmonton for June 30, 2009, and July 1, 2009, when the July record was sent.
Only able to view on my phone, but they look like some sort of Oak.
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