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It's Cold in Mexico! During the day it's usually warm at the monarch's winter home in Mexico, but at night it's as cold as the inside of your refrigerator! Sometimes it's even cold enough to snow. Most people are puzzled when they hear this. Why do monarchs migrate across the continent to spend the winter in a place that is cold? As it happens, monarchs need cool temperatures to survive. Let's find out why, and let's see how the monarch's forest helps to protect them. Photo ©Lincoln Brower, Sweet Briar College           This Season Teachers Kids Orientation Registration Search Copyright 1997-2009 Journey North. All Rights Reserved. Questions or comments? Contact us.