Large Data Set

Question 1

Daily mean temp

Answer 1

Degrees C

measured 1.25m above short grass

covers 0000-0000

Question 2

n/a

Answer 2

data not available

Question 3

Daily total rainfall

Answer 3

mm

tr means a trace of rain

starts at 9am - 0900-0900

Question 4

Daily total sunshine

Answer 4

hours

measured in 10ths

Question 5

Daily maximum humidity

Answer 5

measure of how close air is to being saturated with water vapour

above 95% is mist or fog

Question 6

Wind

Answer 6

Knots = 1.15 mph

daily mean speed - averaged over 24hours
max gust speed - max instantaneous gust
mean wind direction - averaged over 24hours
direction of max gust - measured in degrees from true north

Question 7

Visibility

Answer 7

greatest distance at which an object can be seen and recognised in daylight

measured using a viscometer at automatic sites

measured in Decametres (Dm)

Question 8

Pressure

Answer 8

Pascal

measured at station level

Question 9

Daily mean total cloud cover

Answer 9

fraction of the celestial dome covered by cloud

measured in 8ths (Octals)