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Where and When is it Too Cold to Fly?
8 am 11 am 5 pm

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 cannot fly until their flight muscles are 55°F. As a general rule, they need air temperatures of at least 50°F on a sunny day or 60°F on a cloudy day.

  • Assuming it was sunny, where and when was it too cold to fly on this October day?





What's happening now?
Look at the current air temperature map for the United States. Where is it warm enough for monarchs to fly now?