19-24 Mph 29-38 kph 17-21 knots Fresh Breeze Small trees sway. White crested wavelets (whitecaps) form, some spray. 25-31 Mph 39-49 kph 22-27 knots Strong Breeze Large tree branches move, telephone wires begin to whistle, umbrellas are difficult to keep under control. Larger waves form, whitecaps prevalent, spray.

A wind speed of 20 mph is generally classified as a "Fresh Breeze" (Force 5) on the Beaufort Scale. While not typically considered "strong" in a dangerous sense, it is enough to make small trees with leaves begin to sway and to cause crested wavelets to form on inland waters. On land, it can raise dust and loose paper and make it difficult to use an umbrella. For comparison, a "Strong Breeze" (Force 6) begins at 25 mph, where large branches move and whistling is heard in wires. Therefore, 20 mph is a moderate-to-fresh wind that is noticeable and can affect outdoor activities but is generally safe for most travelers and structures.