A 2020 NTSB investigation revealed that pilots assumed flight in snow was safe as long as minimum ceiling and visibility requirements were met or that snow conditions were too dry or cold to pose an icing hazard. Pilots also assumed that snow conditions are safe to fly in as long as you can see through it — they did not consider the effects of icing, NTSB officials said, adding these assumptions can be deadly.
Source: general aviationStay safe in the snow