The temperature this morning was 40f and there was frost on the porch railings and cars. However the temperature never got below 40f overnight. The temperature yesterday was 58f during the day.
In: 2
Lower local temperatures. The air was 40F on average but it would have hots spots and cold spots. Evaporating water, wind chill, and even more exposure to the sky can cause a surface to become much colder than the surrounding air.
So while the air wasn’t cold enough to freeze water, your window was.
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