It’s the most wonderful time of the year—the time NASA’s SnowEx campaign hits the skies and ground of the world’s snowy places, measuring snow properties to understand how much water is contained by each winter’s snowfall. SnowEx includes partners from universities, private institutions and other government agencies who bring additional expertise and instruments—such as the National Oceanic and Atmospheric Administration’s airborne gamma instrument and the University of Alabama’s FMCW radar. These instruments cannot be used in space, but they will help the snow science community advance their understanding of snow across various conditions.