Why does it frost at the time it does?

Why does frost occur at the time it does-around 4 o’clock in the morning until around nine o’clock in the morning- what is it about that time of the morning that makes the frost appear then, and why does turning a sprinkler on and letting it water the plants protect the plants from frost damage?

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[+1] - NickFun - 02/10/2009It frosts over when the temperature goes below 33F (Oc). When you water the plants the water is warmer than the frost thus protecting the plants. I wish it was something more romantic but...
[+1] - Butrflynet - 02/14/2009Here are some good explanations to supplement Nick's information: http://www.farmersalmanac.com/weather/a/what-causes-frost http://www.weatherquestions.com/What_causes_frost.htm ...

@connielee,

It frosts over when the temperature goes below 33F (Oc). When you water the plants the water is warmer than the frost thus protecting the plants.

I wish it was something more romantic but that's the way it is.

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@connielee,

Here are some good explanations to supplement Nick's information:

http://www.farmersalmanac.com/weather/a/what-causes-frost

http://www.weatherquestions.com/What_causes_frost.htm

http://www.redwoodbarn.com/DE_frost_protect.html

http://wiki.answers.com/Q/How_does_spraying_orange_trees_with_water_stop_the_crop_from_freezing

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Why does it frost at the time it does?

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