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The definitive guide to forecasting snowfall in the Vale of Glamorgan, Wales
Snowfall occurs when the column of air from cloud to surface is mostly below freezing, or any above-freezing layers are too shallow to melt the snow completely. It can also snow at 1–4°C when either evaporative cooling (in dry air) lowers the temperature as snowflakes fall or when they are heavy enough to survive melting.