The wind vane points into the oncoming wind and the 10 minute average wind direction is recorded. To interpret wind direction see the diagram below.
Therefore:
0° or 360° is true northerly wind (from the north)
90° easterly wind (from the east)
180° southerly wind (from the south)
270° westerly wind (from the west)
Units: Degrees of a circle
Range: 360o
Resistance: 1o
Accuracy: +/-10o