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At this coldest time of year, monarchs are at the greatest risk of mortality from deadly winter storms.

Read more about Image Monarch: January

Scientists visit the 12 wintering sites and measure the surface area the colonies cover. Results will be released by March, 2017.

Read more about Image Monarch: December

November - Arrival

Read more about Image Monarch: November

Next Update February 6, 2018

Read more about Monarch Maps Winter 2017-2018

The Monarch's Winter Habitat

Read more about 12/01/17 Journal The Monarch's Winter Habitat

The Overwintering Season

What happens month-by-month while the monarchs are in Mexico?

Monarch butterflies at winter sanctuaries in Mexico

What happens month-by-month while the monarchs are in Mexico?

Population: Compare Winters

Graph: Compare Monarch Butterfly Winter Population Size

Compare Winter Populations

Monarch Butterfly Population

Graph: Monarch Butterfly Winter Population Size

Monarch Butterfly Population

Live Wind Map

Live Wind Map

https://s3.us-east-2.amazonaws.com/journeynorth.org/images/graphics/weather/win…

Pato Moreno

Read more about 11/09/17 Cerro Pelon Pato Moreno

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