Wind measurements from Automatic Weather Station (AWS) at Freiburg – Chemiehochhaus (FRCHEM) from 2021-01-01 to 2021-12-31 [L2]

Quality controlled and gap-filled continuous wind speed and wind direction data from the urban rooftop weather station at Freiburg-Chemiehochhaus (FRCHEM, 7.8486ºE, 48.0011ºN, 323.5 m) measured using a cup anemoemeter (Lambrecht 00.14576.250 004) and a wind vane (Vector Instruments W200P) operated on a mast 10 m above roof level.

• Quality controlled wind speed and wind direction data are available and aggregated at 10min, 30min, hourly, daily, monthly and yearly resolution for the year 2021. 
• Wind speed is provided in m/s as average and maximum (gust maximum, measured every 3 sec) over the period shown, respectively. The minimum wind speed provided / measured is 0.4826 m/s as (threshold value of the cup anemometer). Hence a measurement of 0.4826 can be any value between 0 and 0.4826 m/s.
• Wind speed classes are reported as number of hours with average and maximum wind within the Beaufort classes as follows: Beaufort 0 and 1 (Calm and light air): 0 — 1.6 m/s, Beaufort 1 (Light breeze):  1.6 — 3.4 m/s, Beaufort 2 (Gentle breeze): 3.4 — 5.5 m/s, Beaufort 4 (Moderate breeze): 5.5 — 8 m/s, Beaufort 5 (Fresh breeze): 8 — 10.8 m/s, Beaufort 6 (Strong breeze): 10.8 — 13.9 m/s, Beaufort 7 (Moderate gale): 13.9 — 17.2 m/s, Beaufort 8 (Gale): 17.2 — 20.8 m/s, Beaufort 9 (Strong/severe gale): 20.8 — 24.5 m/s, Beaufort 10 (Storm): 24.5 — 28.5 m/s, Beaufort 11 and higher: 28.5 — 50 m/s.
• Wind direction is provided in geographic degrees (relative to geographic North, not magnetic North) with standard geographic definition of wind direction (0° = wind from North, 90° = wind from East, 180° = wind from South and 270° = wind from West).
• Wind direction is reported as number of hours with average vector wind direction per 10° sector (36 classes of 10° from 0°-360°) for daily, monthly and yearly scales, wind direction is also reported as number of days with average vector wind direction on monthly and yearls scales.
• Files "FRCHEM_2021_Windrose.html" and "FRCHEM_2021_Windrose.pdf" provide monthly and annual wind roses for the year 2021 in intercative and graphical formats.
• Detailed information on gap-filled data is provided.
• Note: All times are provided in UTC, not local time.

For more details read `FRCHEM_2021_WindSpeed_MetaData.txt` and `FRCHEM_2021_WindDirection_MetaData.txt`.