To cold to snow and diamond dust ?

Question

at what tempature is to cold to snow and does it have to be zero humidity, also does diamond dust occur when it goes below that tempature ?

Answer 1

hey that guy above me just copied that from the link he gave but it was interesting all the same, that was the answer i was going to give you...

Answer 2

Truth is, it is never too cold to snow, though the conditions which bring the coldest temperatures are usually non-conducive to producing precipitation. But, it is also true that the colder the temperatures, the less water vapour the air may contain. In fact, the amount of water vapour at saturation drops by about a factor of two for every 10 Celsius degrees (18 Fahrenheit degrees) drop in air temperature.

At very cold temperatures, 40oCelsius below zero and colder, snow can actually fall out of the cleanest, clearest blue sky without intervening clouds. Temperatures need not be so cold if there is dust, or other minute particles, in the air on which the water vapour may deposit. When condensation nuclei are present, diamond dust may form at temperatures just below minus 20oC (0 oF). At such temperatures, the water vapour in the air spontaneously forms ice crystals which slowly settle earthward. When these falling crystals are caught in the light, they sparkle like gemstones, a weather condition known appropriately enough as diamond dust.