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What does daily mean temperature mean?
The average of the hourly temperature readings during a 24-hour period
What does daily total rainfall mean?
The total rainfall or solid precipitation such as snow and hail which has melted per day
What does tr or trace record?
Rainfall amounts less than 0.05mm
What is daily total sunshine?
The amount of sunshine per day recorded to the nearest tenth of an hour
What is daily mean wind direction and windspeed?
The daily wind direction and windspeed averaged over 24hrs from midnight to midnight
What is the daily mean windspeed and wind direction measured in?
Knots
What are mean wind directions given as?
Given as bearings and as cardinal (compass) directions
How is the data for mean windspeed categorised?
Categorised according to the Beaufort scale
If the mean windspeed is categorised as 0 on the Beaufort scale, then what is it described as?
Calm
If the mean windspeed is categorised as 1-3 on the Beaufort scale, then what is it described as?
Light
If the mean windspeed is categorised as 4 on the Beaufort scale, then what is it described as?
Moderate
If the mean windspeed is categorised as 5 on the Beaufort scale, then what is it described as?
Fresh
If the mean windspeed is categorised as 0 on the Beaufort scale, then what is the average speed at 10 metres above ground?
Less than 1 knot
If the mean windspeed is categorised as 1-3 on the Beaufort scale, then what is the average speed at 10 metres above ground?
1 to 10 knots
If the mean windspeed is categorised as 4 on the Beaufort scale, then what is the average speed at 10 metres above ground?
11 to 16 knots
If the mean windspeed is categorised as 5 on the Beaufort scale, then what is the average speed at 10 metres above ground?
17 to 21 knots
What is a knot?
A nautical mile per hour
What is 1 knot equal to in mph?
1.15mph
What does the daily maximum gust mean?
The highest instantaneous windspeed recorded from that day
What is also recorded with the daily maximum gust?
The direction from which it was blowing
What is daily maximum gust measured in?
Knots
What is daily maximum relative humidity given as?
Given as a percentage of air saturation with water vapour
What do relative humidities above 95% give rise to?
Misty and foggy conditions
What are the things recorded for oversea locations?
Daily mean temperature
Daily total rainfall
Daily mean pressure
Daily mean windspeed
What is daily mean cloud cover measured in?
Oktas
What does oktas mean with daily mean cloud coverage?
Eighths of the sky covered by cloud
What does daily mean visibility mean?
The greatest horizontal distance at which an object can be seen in daylight
What is daily mean visibility measured in?
Decametres (Dm)
What is daily mean pressure measured in?
Hectopascals (hPa)
Note 
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