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Winds need to reach sustained speeds or frequent gusts of 35 m.p.h. or greater, and visibilities have to be repeatedly reduced to 1/4 mile or less by falling and/or blowing snow for a period of at least three hours. A blizzard can actually occur with clear skies if the visibility reduction is caused by blowing snow. While there are no temperature requirements for a blizzard, the combination of strong winds and below-freezing temperatures will drop windchills at least into the single digits.

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13y ago
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11y ago

There is no snowfall criteria for blizzards, only visibility.

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11y ago

A blizzard has less to do with temperature than it has to do with wind and white-out conditions.

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Q: When is a winter storm considered a blizzard?
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