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More Hot Days Across the U.S.

More Hot Days Across the U.S.

See the trend in hot days in these U.S. cities.

Small Change in Average, Big Change in Extremes

Small Change in Average, Big Change in Extremes

A small increase in average temperature leads to a big increase in extreme heat.

Hottest Days Coming Earlier

Hottest Days Coming Earlier

The first day with summer-like temperatures is happening earlier for most of these cities.

Rising Global Temperatures and CO2

Rising Global Temperatures and CO2

The amount of carbon dioxide in the atmosphere has a strong correlation with rising temperatures.

U.S. Warming Since the First Earth Day

U.S. Warming Since the First Earth Day

Since the first Earth Day in 1970, the average annual temperature in every state has climbed.

More Water Flowing in California This Year

More Water Flowing in California This Year

More water is flowing this year in California from frequent storms and melting snowpack.

Western Snowpack Up, But Less Likely in the Future

Western Snowpack Up, But Less Likely in the Future

Western snowpack at the end of the the wet season is up this year — but that's less likely in the future.

Snow Cover on the Decline in North America

Snow Cover on the Decline in North America

Snow cover in North America is on the decline in part due to climate change.