Flight Threshold
A monarch is paralyzed by cold temperatures. It can't fly unless its flight muscles are at least 55°F. On a cool day, a monarch can bask in the sun to reach flight threshold.
"At 10:30 the butterflies that were warmed by the morning sun were flying around and those in the shade were still hanging in the trees."
—Tanner Hanson
Christy Smith
![Monarch Butterfly Migrating, Great Lakes](//sightings.journeynorth.org/jnorth/images/userfiles2014/09/1410800706.800.jpg)
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