Eli5 how does frost form on surfaces when the temperature is above 32f (0c)?

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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.

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Anonymous 0 Comments

It was explained to me that…… The depth of the universe acts as an infinite heat sink, drawing the heat out of surfaces that are exposed to it. Frost can form on surfaces at temperatures as high as 40 degrees ambient. It’s why a car parked in the open will have frost while a car under a carport won’t on the same morning.

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