Globally, 2015 set a new record for the most extremely warm days in the 66-year record (1.8 times more than the average). The number of extremely warm days and nights was the highest ever recorded in western North America, parts of central Europe, and central Asia.

Using measurements taken worldwide, scientists estimated that 2015’s global average carbon dioxide concentration was 399.4 parts per million (ppm), a new record high. At Mauna Loa Observatory in Hawai’i, where atmospheric carbon dioxide has been recorded longer than anywhere else in the world, the annual average carbon dioxide concentration was 400.8—also a new record, and a new milestone.

A record-smashing hurricane season in the central North Pacific. Water rationing in Puerto Rico. The biggest one-year jump in atmospheric carbon dioxide concentrations. These and more of 2015's extreme events had one thing in common: El Niño.

The author of the glacier chapter of the 2015 State of the Climate report and his daughter talk about how family connections brought them together scientifically, and how science keeps bringing their family together.

In the 2015 edition of the State of the Climate report, climate and biology experts wrote about some dramatic impacts of warming on life in the ocean.

Every year hundreds of scientists from scores of countries team up to give the Earth's climate a comprehensive physical. Edited by NOAA scientists and published by the American Meteorological Society, the State of the Climate in 2015 draws on tens of thousands of observations of everything from forest fires to fish migration to catalog climate variability and change.

A new study published in Environmental Research Letters shows that scientists could use the Gulf of Mexico's sea surface temperature (SST) to forecast whether atmospheric conditions are favorable ... ...

Extreme heat in Kuwait last week might have set a new high temperature record for Asia and the Eastern Hemisphere. How do climate experts verify such records?

Residents, communities and businesses now have easy access to climate projections, through a few easy keystrokes, for every county in the contiguous United States. NOAA's newly updated Climate ... ...

Summary: Explore climate projections for any county in the United States. For the contiguous U.S., you can compare maps of past and projected conditions for coming decades or consult historical records to see when weather has veered outside of normal climate.