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It doesn't have to be cold. In fact hail forms best if it is fairly warm near the ground. No matter how warm it is at the ground, temperatures in the upper troposphere are very cold, though extactly how cold can vary. Hail forms in thunderstorms with strong updrafts. Such storms form best when the lower troposphere is warmer than normal while the upper troposphere is cooler than normal.

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Q: How cold does it have to be for it to hail?
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