Margret Matzl from the Swiss Institute for Snow and Avalanche Research in Davos is an expert at what it takes to make a perfect snowman. As it turns out, it’s a matter of timing.
First, you need enough snow, which happens under the right climate conditions. Then the snow crystals turn into snowflakes on their way to the ground. And finally, the structure of the snow on the ground changes over time. Armed with this knowledge, making the perfect snowman is a snap.