More Warm Spring Days

Astronomical spring, marked by the vernal equinox, begins at 6:29 a.m. (10: 29 GMT) on Monday, March 20. This is the date when the amount of daylight is equal to the amount of night across all parts of the globe. The term “equinox” comes from the Latin, meaning “equal night.” Spring is getting warmer, on average, as the globe heats up from the


Leaves Emerging Earlier as Planet Warms

The large winter storm and hard freeze that have followed the very warm February in the Northeast provide a vivid example of a weather one-two punch that may become more common in the future. Spring, as measured by the appearance of the first leaves on trees, is arriving sooner than in the past as the planet continues to warm from greenhouse gases

Snow at Lake Tahoe

It Was a Good Water Year in California, But Don’t Get Used To It

Winter is the wet season in California, and the amount of rain and snow that has fallen across the Golden State in the past few months has been phenomenal, building up the mountain snowpack that is so crucial to the state’s water supplies.The much-needed soaking was what was expected last winter, when an exceptionally strong El Niño was in full

Arctic sea ice extent nears its peak

Arctic Sea Ice Continues Its Astonishing Streak of Lows

Here’s your monthly reminder: something just isn’t right in the Arctic. February continued the string of record or near-record monthly sea ice lows. Warm weather ensured Arctic sea ice hit its lowest extent ever recorded for February. At 455,600 square miles below average, the Arctic was missing a chunk of sea ice four times the size of Italy

warm gulf of mexico

The Southeast Just Had One of Its Warmest Winters

The southeastern U.S. has wrapped up one of its warmest winters on record. For instance, since data collection began at Baton Rouge Metropolitan Airport in 1930, no winter has seen more days reach 80°F. There were 23 of them, normally there are four, and the previous record was 17 in 1957. The December through February average temperature of


Climate Indicators

Learn more about the 10 key indicators of a warming climate


Arctic Sea Ice

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


El Niño

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


Ocean Acidification

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


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


Extreme Heat

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


Snow Cover

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


Sea Level Rise

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


Land Ice

Melting land ice contributes to sea level rise.


U.S. Wildfires

Wildfires damage forests and release CO2.


Global Temperature

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