What is daily mean temperature measured in?
degrees Celcius (°C) to 1 d.p
What is daily total rainfall?
It includes any solid precipitation, such as snow or hail, which is melted and measured in the same way as rainfall.
What is daily total rainfall measured in?
millimetres (mm) to 1 d.p
What is daily total sunshine measured in?
hours (hr) to 1 d.p
What is daily maximum relative humidity measured in?
percentage (%) to the nearest integer
What is daily mean windspeed measured in?
- knots (kn) to the nearest integer
- Beaufort Conversion (calm, light, moderate etc…)
How many values are on the Beaufort scale? What does 0 and 12 mean?
(13 values)
0 is calm
12 is hurricane
What is daily mean wind direction measured in?
- degrees (°) to the nearest 10
- cardinal direction (N, S, SE, NSN, etc..)
What is daily maximum gust measured in?
knots (kn) to the nearest integer
What is daily maximum gust direction measured in?
- degrees (°) to the nearest 10
- cardinal direction (N, S, SE, NSN, etc..)
What is cloud cover measured in?
oktas, where one okta = one eighth of the sky covered
What is daily mean visibility measured in?
decametres (Dm / dam) to the nearest 100
1 Dm = 10m
What is daily mean pressure measured in?
hectopascals (hPa) to the nearest integer
1hPa = 100 Pa = 1 millibar
What four variables are recorded for the three international locations?
The three international cities only contain data for daily mean temperature, daily total rainfall, daily mean pressure and daily mean windspeed.
Which variables are qualitative?
Wind direction and windspeed on the Beaufort scale.
Which variable is discrete?
Cloud cover and windspeed on the Beaufort Scale
A daily maximum relative humidity of 95%+ is associated with what?
Mist and fog
1 knot is equal to what speed in mph?
1.15 mph speed
What scale can oktas take?
0-8
Describe the weather when cloud cover is 0 oktas compared to 8 oktas
0 oktas - clear
8 oktas - completely overcast
Which weather variable may contain ‘tr’ and when does this occur?
Daily total rainfall - when there is less than 0.05mm. Take these values as 0 when calculating statistics.
