The Inuit tell stories about the year that summer never arrived. Tree rings from 1783 confirm that the Laki volcano in Iceland caused the cooldown.

You need a new shot every year because current flu vaccines provide limited and temporary protection. But researchers' new strategy could mean a one-and-done influenza vaccine is on the way.

Marijuana use is lowest at the beginning of the year. Researchers think New Year's resolutions may play a role.

Since 1979, the average number of snow days has fallen by about five per decade.

Warmer temperatures cannot increase the amount of carbon deciduous trees absorb in each growing season, a new study suggests.

An expert explains seasonal affective disorder and why this year could be especially tough. She also outlines steps you can take to feel better.

North Americans are most likely to succeed in getting pregnant in late November and early December, especially if they live in the US South.

States have been experimenting with more targeted approaches to slow the coronavirus's spread. Two strategies stand out.

Last week, much of the Midwest and eastern US experienced hazy skies and red sunsets. The cause was smoke transported from the Western US by the jet stream and spread as far as Boston and even Europe.

New research on marmots in the US reveals how the topsy-turvy seasons are causing havoc among wildlife.