LARGE DATA SET Flashcards
WHICH MONTHS DO WE HAVE DATA FOR
We only have data for May to October.
WHICH YEARS DO WE HAVE DATA FOR
We have data from 1987 and 2015.
DEC, JAN, FEB
Windier
Wetter
Darker
Colder
JUN, JUL, AUG
Calmer
Drier
Brighter
Hotter
UK STATIONS
From South to North:
Camborne
Hurn
Heathrow
Leeming
Leuchars
If the temperature increases…
… the amount of sunshine ________
… the amount of rainfall ________
… the wind speed ________
increases
decreases
decreases
As we move further north, during May to October…
… the temperature________
… the amount of rainfall________
… the maximum hours of sunshine________
decreases
increases
increases
DAILY MEAN TEMPERATURE
How hot it is
UNITS
°C
TYPICAL RANGE
~5°C to ~24°C
DETAILS
Warmer in summer
(Warmer in summer, but Perth is colder)
DAILY TOTAL RAINFALL
How much it rained
UNITS
mm
TYPICAL RANGE
0 to ~20mm
DETAILS
Not symmetrical- many 0 and tr values
(Beijing is rainy in the summer)
DAILY TOTAL SUNSHINE
How many hours of sunshine
UNITS
hours
TYPICAL RANGE
0 to ~14 hours
DETAILS
More sunshine in the summer
CLOUD COVER
How much of the sky is covered in clouds
UNITS
oktas
TYPICAL RANGE
0 to 8
DETAILS
Integers, measuring what fraction of the sky is covered
HUMIDITY
How much water vapour is in the air - above 95% is associated with fog
UNITS
%
TYPICAL RANGE
~70% to 100%
DETAILS
Integers
DAILY MEAN VISIBILITY
How far you can see
UNITS
1Dm = 10m
‘decametre’
TYPICAL RANGE
~200Dm to ~4000Dm
DETAILS
Rounded to the nearest 100
DAILY MEAN PRESSURE
How much of the atmosphere is pushing down
UNITS
hPa
‘hectopascals’
TYPICAL RANGE
~990hPa to ~1040hPa
DETAILS
Integers
RAINFALL, ‘tr’
Means trace, for values of rainfall between greater than 0 but less than or equal to 0.05. Cleaning the data means treating this as 0 or 0.025 in calculations.
N/A
Means reading is not available, so can’t use in a sample. Cleaning the data means removing the entry.
DAILY MEAN WIND SPEED
How windy it is
UNITS
kn (knots)
TYPICAL RANGE
~3kn to ~10kn
DETAILS
Integers only
(In international measurements, rounded to 1d.p)
WINDSPEED, BEAUFORT CONVERSION
UNITS
Qualitative
TYPICAL RANGE
Light
Moderate
Fresh
Strong
DETAILS
Qualitative, most days are ‘light’
DAILY MAXIMUM GUST
The strongest gust of wind that day
UNITS
kn (knots)
TYPICAL RANGE
~8kn to ~50kn
DETAILS
Integers only
WIND/GUST DIRECTION (BEARINGS)
Which direction the wind is blowing from
UNITS
°
TYPICAL RANGE
10° to 360°
DETAILS
Multiples of 10 only
WIND/GUST DIRECTION (CARDINAL)
Which direction the wind is blowing from
UNITS
Compass direction
DETAILS
Describes where the wind is blowing from, not to
JACKSONVILLE, FLORIDA, USA
Hot summers
Hurricanes in October (but mean wind speed is relatively low in our data)
BEIJING CHINA
Hotter, wetter summers
Colder winters
PERTH, AUSTRALIA
Flipped seasons
