5 UK locations from North to South
Leuchars, Leeming, Heathrow, Hurn, Camborne
3 oversea locations
Beijing, Jacksonville and Perth
Time periods
May to October 1987 and 2015
Daily mean temperature
Average of the hourly temperature readings during a 24 hour period measured in *C
Daily total rainfall
- Includes solid precipitation like snow and hail
- Amounts less than 0.05mm are recorded as ‘tr’ or trace
Daily total sunshine
Recorded to the nearest tenth of an hour
Daily mean wind direction and windspeed
- Measured in knots
- Mean wind direction is given as bearings
- Mean windspeed is categorised in the Beaufort scale
Daily maximum gust
- Measured in knots
- Highest instantaneous windspeed recorded
Daily maximum relative humidity
A percentage of air saturation with water vapour
Daily mean cloud cover
Measured in oktas or eighths of the sky covered by cloud
Daily mean visibility
- Measured in decametres
- Greatest horizontal distance at which an object can be seen in daylight
Daily mean pressure
Measured in hectopascals
Overseas locations factors recorded
Daily mean temperature, Daily total rainfall, Daily mean pressure and Daily mean windspeed
