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Frost Free Season is Getting Longer

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Frost Free Season is Getting Longer

All regions of the continental U.S. have seen the frost-free season, defined as the stretch between the last below-32°F reading in the spring and the first in the fall, grow longer.

Climate Change Indicators

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Climate Change Indicators

A graphical look at the top indicators of a warming world.

September Arctic Sea Ice

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September Arctic Sea Ice

2014's Arctic sea ice minimum isn’t going to be as low as the record set in 2012, but it will be well below the 1981-2010 average.

Antarctic Ice: What’s Going On

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Antarctic Ice: What’s Going On

September marks the end of winter when the sea ice that surrounds Antarctica swells to its maximum extent.

Fall Temperature Trends

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Fall Temperature Trends

The big picture is clear: Overall, fall is warming across the U.S, 0.46F per decade since 1970.

Fall Precipitation Trends

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Fall Precipitation Trends

Fall precipitation has changed since the early 1970s, but unlike fall temperatures, the changes form more of a patchwork story.

California Drought Intensifies

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California Drought Intensifies

The relentless heat that has plagued the western half of the country this summer has ratcheted up California’s terrible drought once again.

Hottest Days of Summer

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Hottest Days of Summer

The hottest time of year in the continental U.S. statistically comes in mid-July, but the timing of peak heat varies across different parts of the country.