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How and why does it snow?
Snow falls from clouds that contain enough cloud droplets and ice crystals
for precipitation to form. In order for snow to reach the ground without
melting, the wet bulb temperature of the air near the ground must be below
freezing. The wet bulb temperature is the temperature measured by a thermometer
that has a little wet sock covering the bulb before it is swung in a circle
in the air. Thus, you can have snow fall reaching the ground even when
the air temperature is slightly above freezing.
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