The First Frost is Coming Later

Coming off of a warm September, warmer falls are becoming a trend across the U.S., with the first freeze (temperature below 32°F) of the season arriving later than before. This trend is not limited to one area of the country. The first freeze is coming a full month (31 days) later in Boise, Idaho, 27 days later in Las Vegas, Nevada, and 24 days lat

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Climate Change and Fall Foliage

With the end of September fast approaching, many people across the U.S. are eagerly watching the trees for their annual display of brilliantly colored fall foliage. A drop in temperatures and a change in the amount of daily sunlight are the standard cues for trees to begin shutting down for winter — changing the colors of their leaves in the

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washington wildfire

Large Wildfires Are Increasing. This Is What We Know About Wildfire Severity

With fire season starting to ramp up, we are again reminded of a clear trend that has emerged in the western U.S. in recent decades. We are experiencing larger and more frequent wildfires. The metric most frequently used to quantify this trend is area burned, or how large in terms of acres or hectares a given fire’s scorching fingertips managed

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More Frost-Free Days Means a Longer Growing Season

The growing season is now nearly two weeks longer on average across the U.S. compared to the beginning of the 20th century. While this may delight warm-weather lovers, warmer overnight temperatures can reduce productivity and quality of grains and fruits, which might increase their costs at the supermarket. Warmer average temperatures lead to an in

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Summers Are Lengthening While Winters Shrink

While the West has been feeling the heat, fall-like temperatures dominated the eastern half of the country in August. But just as the calendar flips to astronomical fall, summer-like heat is making a return to many of those same places. So this week we examine the last annual occurrence of a hot, summer-like day in these U.S. cities.

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Climate Indicators

Learn more about the 10 key indicators of a warming climate

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Arctic Sea Ice

Ice has both ecological and economic benefits and its extent could influence weather around the world.

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El Niño

El Niño is a warming of waters in the equatorial Pacific that influences global weather patterns.

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Ocean Acidification

Acidifying oceans can hurt coral reefs and shellfish as well as the people that rely on them for their livelihoods.

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Carbon Dioxide

CO2 is a potent greenhouse gas and plays a vital role in regulating Earth's surface temperature through radiative forcing and the greenhouse effect

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Extreme Heat

Increasing frequency and magnitude of extreme heat can affect health, power usage and more.

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Snow Cover

A shorter snow season increases the amount of sunlight absorbed by the Earth’s surface and can further warm the planet.

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Sea Level Rise

Sea level rise could force millions to leave coastal areas and cost the world trillions of dollars.

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Land Ice

Melting land ice contributes to sea level rise.

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U.S. Wildfires

Wildfires damage forests and release CO2.

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Global Temperature

The global temperature is the clearest measure of how human greenhouse gas emissions are affecting our planet.

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