How to calculate the daily average wind speed

The daily average wind speed has to be measured from 8 UTC current day to 7 UTC the next day, according to the DPRA Heat stress report. The wind speed is also measured in 0.1 meters, so the values from the KNMI weather data column FH have to be divided by 10 to get to a value in m/s.

Column	Name	Unit	Dutch Description
2/B	YYYYMMDD	Date	datum (YYYY=jaar,MM=maand,DD=dag)
3/C	HH	Hour	tijd (HH=uur, UT.12 UT=13 MET, 14 MEZT. Uurvak 05 loopt van 04.00 UT tot 5.00 UT
4/D	DD	Degrees	Windrichting (in graden) gemiddeld over de laatste 10 minuten van het afgelopen uur (360=noord, 90=oost, 180=zuid, 270=west, 0=windstil 990=veranderlijk. Zie [1]
5/E	FH	0.1 m/s	Uurgemiddelde windsnelheid (in 0.1 m/s). Zie [2]

Notes

• The wind speed (hourly, and daily average) can also be based on an other data source; Potentiele wind (UP): http://projects.knmi.nl/klimatologie/onderzoeksgegevens/potentiele_wind-sigma/. These values are often a few 0.1 m/s higher than the values from the historical KNMI weather data table.

See also

• KNMI weather data
• Daily avg wind speed (Heat Overlay)