The Large Data Set MEGA INFO

Question 1

Daily mean temperature

Answer 1

in *C - this is the average of the hourly temperature readings during a 24 hour period

Question 2

Daily total rainfall

Answer 2

including solid precipitation such as snow and hail, which is melted before being included in any measurement - amounts less than 0.05 mm are recorded as ‘tr’ or ‘trace’

Question 3

Daily total sunshine

Answer 3

recorded to the nearest tenth of an hour

Question 4

Daily mean wind direction and windspeed

Answer 4

in knots, averaged over 24 hours from midnight to midnight. mean wind directions are given as bearings and as cardinal (compass) directions. the data for mean windspeed is also categorised according to the Beaufort scale

Question 5

Beaufort scale 0

Answer 5

calm - less than 1 knot

Question 6

Beaufort scale 1-3

Answer 6

light - 1 to 10 knots

Question 7

Beaufort scale 4

Answer 7

moderate - 11 to 16 knots

Question 8

Beaufort scale 5

Answer 8

fresh - 17 to 21 knots

Question 9

Daily Maximum gust

Answer 9

in knots - this is the highest instantaneous windspeed recorded. the direction from which the maximum gust was blowing is also recorded

Question 10

Daily maximum relative humidity

Answer 10

given as a percentage of air saturation with water vapour. relative humidities above 95% given rise to misty and foggy conditions

Question 11

Daily mean cloud cover

Answer 11

measured in ‘oktas’ or eights of the sky covered by cloud

Question 12

Daily mean visibility

Answer 12

measured in decametres (Dm). This is the greatest horizontal distance at which an object can be seen in daylight

Question 13

Daily mean pressure

Answer 13

measured in hectopascals (hPa)