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Why are the monarch butterflies not arriving in October?

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Not across the Texas-Mexico border, where most monarch butterflies should be by that time of year. These fluttered tardily ... Average high temperatures in the Northeast exceeded 60 degrees in September and October for the first time, according to the National Oceanic and Atmospheric Administration. read more

Monarch butterflies are not able to survive the cold winters of most of the United States so they migrate south and west each autumn to escape the cold weather. The monarch migration usually starts in about October of each year, but can start earlier if the weather turns cold sooner than that. read more

To get a sense why the monarch butterflies are in decline, I called Lincoln Brower, a professor of biology at Sweet Briar College who has studied the monarch migrations for decades. In a paper last year, he cited three major factors: Deforestation in Mexico, recent bouts of severe weather, and the growth of herbicide-based agriculture destroying crucial milkweed flora in the Midwest. read more

Starting in September and October, eastern and northeastern populations of the monarch butterfly migrate from southern Canada and the United States to overwintering sites in central Mexico where they arrive around November. read more

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Thousands of monarch butterflies could be stranded | New ...
Source: nypost.com

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