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What is snow?

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Snow forms when tiny ice crystals in clouds stick together to become snowflakes. If enough crystals stick together, they'll become heavy enough to fall to the ground.

 

Snow forms when tiny ice crystals in clouds stick together to become snowflakes. If enough crystals stick together, they'll become heavy enough to fall to the ground.

Snowflakes that descend through wet air that is slightly warmer than 0°C will melt around the edges and stick together to produce big flakes. Snowflakes that fall through cold, dry air produce powdery snow that does not stick together.

Snow

How cold does it have to be to snow?

It is a myth that the temperature needs to be below zero to snow, instead precipitation falls as snow when the air temperature is below 2°C. If above 2°C, the snowflake will melt and fall as sleet.

Snowfall can be defined as 'slight', 'moderate' or 'heavy'. When combined with winds, a snowfall can create blizzards and drifts.

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