Wind Vane

Wind direction will be measure with a wind vane (see diagram), wind direction is the compass point from which the wind is coming south, southwest, west etc.  The unit of measurement for wind direction is therefore compass direction.  User plot the wind direction for each day of the month on a special graph called a wind rose i.e.  Wind Vane is manufactured as per IS:5799:1970 which indicates the direction of wind at the point of observation.