Large data set

What are the 5 UK weather stations?

• Cambourne - town - Cornwall

• Heathrow - Greater London

• Hurn - village - Dorset

• Leeming - village - North Yorkshire

• Leuchars - town - Scotland

What are the 3 overseas weather stations?

• Beijing

• Jacksonville

• Perth

What time periods is the data from?

• May to October 1987

• May to October 2015

Which 4 variables are recorded in the UK and overseas?

• daily mean pressure

• daily mean windpseed

• daily total rainfall

• daily mean temperature

What units is daily mean temperature in?

°C

How is daily mean temperature recorded?

An average of the hourly temperature readings over a 24 hr period

What types of precipitation does daily total rainfall include other than rain?

Melted solid precipitation (like snow)

What does ‘tr’ or ‘trace’ mean for daily total rainfall?

Amounts less than 0.05mm

What is daily total sunshine recorded to (decimal places)?

Nearest 10th of an hour (0.1)

What is daily mean windspeed measured in?

Knots

How is daily mean windspeed measured?

An average of readings over 24 hrs (midnight to midnight)

What is daily mean wind direction measured in?

Cardinal (compass) directions and bearings

How is data for mean windspeed categorised?

Using the Beaufort scale

What are the descriptive terms and knots for 0-5 on the Beaufort scale?

• 0 - calm - <1 knot

• 1-3 - light - 1 to 10 knots

• 4 - moderate - 11-16 knots

• 5 - fresh - 17 - 21 knots

What is daily maximum gust measured in?

Knots

What about daily maximum gust is recorded?

Highest instantaneous wind speed and direction of gust

What os daily maximum relative humidity measured as?

Percentage of air saturation with water vapour

What may relative humidities of about 95% give rise to?

Misty and foggy conditions

What is daily mean cloud cover measured in?

Oktas (eights of the sky covered by cloud)

What is daily mean visibility measured in?

Decametres (Dm)

What is daily mean visibility?

The greatest horizontal distance at which an object can be seen in daylight

What is daily mean pressure measured in?

Hectopascals (hPa)

How are missing data values indicated?

‘n/a’ or ‘not available’

What is a knot (kn)?

A nautical mph

How many mph is 1 knot?

1 kn = 1.15 mph

How many millibars (mb) is 1 hectopascal (hPa) equivalent to?

1 hPa = 1 mb

Which locations are near a coast?

• Jacksonville

• Perth

• Leuchars

• Cambourne

• Hurn

Which locations are inland?

• Leeming

• Heathrow

• Beijing

Which locations are in the Southern Hemisphere

Perth

Give an example of a discrete variable

Cloud cover

What is an important event for the 1987 data?

October - great storm

How many days does the LDS cover?

184