Yes, snow forms when the atmospheric temperature is at or below freezing (0°C or 32°F).
While the ground temperature is a factor, the key temperature is higher up in the atmosphere where the snow crystals form. Here's a more detailed explanation:
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Snow Formation: Snow forms in clouds when tiny ice crystals stick together to become snowflakes. This process requires the air temperature in the cloud to be at or below freezing.
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Temperature's Role: For snow to reach the ground as snow, the temperature through most of the atmosphere needs to be at or near freezing. If warmer air is present, the snow may melt and turn to rain or sleet before it reaches the ground.
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Moisture is Essential: You also need moisture in the air for snow to form.
In short, while ground temperature plays a role, the atmospheric temperature where the snow forms must be at or below freezing for snowflakes to begin their journey to the ground.
