The terminal velocity of snowflakes

Measurements of the terminal velocity of aggregate snowflakes at the ground indicate that the velocity is approximately proportional to the one‐tenth power of the mass. The constant of proportionality is dependent on the basic crystal types in the aggregates. It is moreover greatly increased by riming or by slight melting of the snowflakes. When snow grows markedly at a generating level, the rate of fall of the snow particles as determined from radar observations is found to correspond to the velocities of aggregates. It is thus inferred that aggregation can occur at temperatures far below the freezing point.