During a recent snowfall, Richard Born, a retired associate professor from Northern Illinois University, captured a slo-mo video (240 frames/s) of falling snowflakes using his iPhone® X. The camera was approximately a foot in front of a wooden fence to serve as a background for the falling snow.

With the video analysis features of Logger Pro® 3, Richard determined both the wind speed and the terminal velocity of snowflakes. His video captured the (x,y) position over time for a dozen snowflakes, and each snowflake was captured in its own series.

Fence orientation during video capture
Analysis of the snowflake horizontal motion yields a wind speed estimate of ~1.4 m/s
Analysis of the snowflake vertical motion yields a terminal velocity estimate of ~2 m/s