The winter of 2011–12 was the second in a row to feature La Niña, the quasi-cyclic cooling of the eastern tropical Pacific—but the two seasons departed from the La Niña script in strikingly different ways.

A new study finds that extremely warm summers are not only occurring more frequently in the contiguous United States, but are likely to become normal by mid-century.

A new study that provides the first comprehensive satellite analysis of Earth’s melting glaciers and ice caps has grave implications for sea level rise.

As I write this, the Boulder winds sound indistinguishable from a car driving by our house. But it is another sound—the sound of ice—that is the inspiration for this blogpost. The ice on ponds and lakes.

Scientists are working to solve a critical wintertime weather mystery: how to accurately measure the amount of snow on the ground.