A windsock is a conical textile tube which resembles a giant sock. windsocks typically are used at airports to indicate the direction and strength of the wind to pilots and at chemical plants where there is risk of gaseousleakage. They are sometimes located alongside highways at windy locations.
Wind direction is the opposite of the direction in which the windsock is pointing (note that wind directions are conventionally specified as being the compass point from which the wind originates; so a windsock pointing dueno rth indicates a sou therly wind). Wind speed is indicated by the windsock’s angle relative to the mounting pole; in low winds, the windsock droops; in high winds it flies hori zontally.
Per F AA standards referenced below, a 15-k not (28 km/h; 17 mph) wind will fully extend the properly functioning windsock. A 3-knot (5.6 km/h; 3.5 mph) breeze will cause the properly functioning windsock to orient itself according to the wind.
Per Transport Canada standards: a 15-knot (28 km/h; 17 mph) wind will fully extend the wind sock, a 10-knot (19 km/h; 12 mph) wind will cause the wind sock to be 5° below the horizontal, a 6-knot (11 km/h; 6.9 mph) wind will cause the wind sock to be 30° below the horizontal.
At many airpo rts, windsocks are lighted at nig ht, either by flood lights on top surrounding it or with one mounted on the pole shining inside it.
windsocks are also popular with children and can have bright and colorful designs. These windsocks are not particularly functional and are mostly for decoration. However, they can be used as a basic guide to wind direction and speed.

link: Custom US Windsock