I always called it Sugar Snow, tiny snow balls that lightly fall from the sky occasionally during the winter. But I guess that's just what our family calls it. Wikipedia calls it graupel, soft snow pellets. It is precipitation that forms when supercooled droplets of water are collected and freeze on falling snowflakes, forming 0.08–0.20 inches balls of rime (white ice). The term graupel comes from the German language.
It is different from Hail which are smaller and translucent, hailstones that consist mostly of water ice and measure between 0.2 - 6 inches in diameter.
What is the Largest Recorded Snowflake? http://bit.ly/tvi9yv
Snow Cams in Michigan http://bit.ly/uUjI3l
Why is snow white and water blue? http://goo.gl/UWE2e
Photographing Snow http://goo.gl/LVLDN
Ever wonder about the first snowman? http://goo.gl/fs7CS