Here’s How Frost-Free Season Affects Allergy Season

Pollen allergies are not just a nuisance. Asthma symptoms can be triggered by exposure to pollen, with the number of emergency room visits increasing on days with high pollen. An analysis of emergency room visits in New York City during 1999 showed peaks in the number of visits correlated with high spring pollen counts, and is consistent with other

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Western Snowpack Trends

April 1 marks the close of the winter precipitation season in the West, a good time to take stock of the snowpack in the mountains. The snow measurement indicates how much meltwater from that snowpack will be available for residential, agricultural, and commercial use during the dry summer months that follow. Even with the heavier snow in parts of

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Growing Season Growth: Additional Frost Free Days

​As the climate warms from the increase of greenhouse gases into the atmosphere, the last spring freeze is trending earlier and the first fall freeze is coming later. This means the growing season is getting longer, and so is the pollen season— whether it is from tree pollens in the spring, grass pollens in the summer, or ragweed in the fall. A

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Warming Spring

March 1 signals the beginning of meteorological spring. In spite of the wintry precipitation that has kicked off the month in parts of the country, springs across the U.S. are getting warmer with climate change. On average, spring has warmed a little more than 2°F in the U.S. since 1970. The strongest warming, as examined by the NCEI climate

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More Downpours: Increase in Heaviest Precip Events

Rivers continue to swell in the Ohio and Mississippi Valleys. More than 10 inches of rain fell last week in Arkansas and Louisiana. While the individual weather pattern may allow for heavy rain, the heaviest of this precipitation is increasing as the world warms from climate change.

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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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