A potent weather system with origins in Manitoba moved south across the Great Lakes on Halloween and blew all the way to Florida, bringing snow and hard frost to regions that don't see either in some winters.
A weak winter storm system dropped thin bands of snow across areas of Oklahoma and Kansas on January 12, 2013. Three days later, the Earth-Observing 1 satellite acquired this view of the snow.
Scientist Tom Painter examines the differences between pure and dirty snow. A rise in dust can be a critical influence on snow-fed water supplies in the American West.
This pair of maps shows average percent snow cover in December 2008 and February 2009, the first and last months of meteorological winter in the Northern Hemisphere.