Estimating the Wind with the Beaufort Scale Learn how to determine the wind speed. This Beaufort Scale is modified for judging the wind on the land. How to Judge the Wind 1-3 mph Light Air Smoke drifts. Wind cannot be felt. 4-7 mph Light Breeze Wind felt on face.
Weather vanes move.
8-12 mph Gentle Breeze Leaves and twigs in motion. Light flags are extended. Moderate Breeze Wind raises dust and loose papers. Small branches move. 19-24 mph Fresh Breeze Small trees in leaf sway slightly.