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scmn | The main reason has to do with the temperature varying with distance from the ground (temperature gradient). On clear, calm nights the air temperature at the ground can be several degrees cooler than at 4-6' above the ground (height at which air temperature measurements are typically taken). This is due to more radiation heat loss (a clear sky does not reflect the radiated heat like a cloudy sky) and no mixing of air layers (wind stirs the air and limits the temperature gradient and warms the ground). It is more so a thermal layer than a micro climate
Here is a pretty good read on dew and frost
https://www.weather.gov/source/zhu/ZHU_Training_Page/fog_stuff/Dew_F...
Edit to add:
Here is a link about frost with above freezing temperature.
https://physics.stackexchange.com/questions/252638/how-does-frost-fo...
Edited by MiradaAcres 10/24/2018 13:59
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Humidity vs dewpoint vs dew
