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

Air temperature is measured 2 meters above the surface. Since cold air sinks, on a calm day the temperature at the ground can be a few degrees colder than at the height they measure temperature.

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