Large Data Set Flashcards
Large data set
Recorded for: May-Oct 1987 and May-Oct 2015.
LDS Locations
National: (from South to North)
- Camborne (Coast)
- Hurn
- Heathrow
- Leeming
- Leuchars (Coast)
International:
- Beijing
- Jacksonville, Florida (hot, tropical, lots of hurricanes and tornadoes)
- Perth, Australia - Southern Hemisphere, winter during our summer and summer during our (Northern hemisphere) winter.
Daily mean temperature
How hot it is
°C
Typical range ~ 5°C to ~24°C
Warmer in summer
Daily total rainfall
How much it rained
mm
0 to ~20mm
tr = trace, value is below 0.05mm so can be replaced with 0 or 0.025
Not symmetrical - many 0 and tr values
Daily total sunshine
How many hours of sunshine
hours
0 to ~14 hours
More sunshine in the summer
Cloud cover
How much of the sky is covered in clouds
oktas
0 to 8 -> can only take integer values
Integers, measuring what fraction of the sky is covered
Humidity
How much water vapour is in the air - above 95% is associated with fog
%
~70% to 100%
Integers
Daily mean visibility
How far you can see
Dm (decametre - 1Dm = 10m)
~200Dm to ~4000Dm
Rounded to the nearest 100
Daily mean pressure
How much the atmosphere is pushing down
hPa (hectopascals)
~990 hPa to ~1040 hPa
Integers
Daily mean windspeed
How windy it is
kn (knots)
~3 to ~10kn
Integers only
Windspeed, Beaufort conversion
Coverts windspeed from quantitative data to qualitative data
Light, Moderate, Fresh, Strong
Most days are ‘light’
Daily maximum gust
The strongest gust of wind that day
kn (knots)
~8 kn to ~50 kn
Integers only
Wing/gust direction (bearings)
Which direction the wind is blowing from
°
10° to 360°
Multiples of 10 onlu
Wind gust/direction (cardinal)
Which direction the wing is blowing from
Compass direction
N, SW, ENE (East of North East)
Describes where the wind is blowing from, not to.
Jacksonville, Florida, USA
Hot summers
Hurricanes in Oct but mean windspeed still relatively low in our data
Beijing, China
Hotter, wetter summers
Colder winters
Perth, Australia
Flipped seasons
International measurements
Only things being measured:
- daily mean temperature (warmer in summer BUT Perth is cooler)
- daily total rainfall (Beijing is rainy in the summer)
- daily mean pressure
- daily mean windspeed (now rounded to 1 d.p.)
- windspeed, beaufort conversion
