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Counting Cold Fronts
The 34th cold front of the season entered Mexico this week. How can cold fronts affect overwintering monarchs? They can bring cold, polar air masses into central Mexico. Cold air, interacting with moisture from the Pacific Ocean, often results in sub-freezing temperatures, wind, hail, snow and ice in the butterfly colonies. Meteorologists predict Mexico will have 50 cold fronts this season. Watch Mexico's daily weather maps. How many more fronts will reach the monarch region?

Weather Map