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Where
and When is it Too Cold to Fly? |
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Also see live temperature map. |
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These maps show how air temperatures changed in the United States over the course of one October day, from 8 am to 5 pm. Monarchs can't fly if their flight muscles are too cold. As a general rule, they need air temperatures of at least 50°F on a sunny day or 60°F on a cloudy day.
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