A Level Maths Large Data Set

• Large data set only contains data from May to October in 1987 and 2015
• May = Spring

  June, July, August = Summer (calm, dry, hot and bright)

  September and October = Autumn
• Locations in UK (hint: from South to North in alphabetical order but switch H and H around)

  1. Camborne (coastal - windier)
  2. Hurn
  3. Heathrow
  4. Leeming
  5. Leuchars (coastal - windier)
• Daily mean temperature (how hot it is) is measured in degrees celsius (°C). It has a typical range range from approximately 5 to 24 °C.
• Daily total rainfall (how much it rained) is measured in millimetres (mm) and has a typical range from 0 to approximately 20mm. Rainfall does not have a symmetrical distribution as many days have 0 or tr values
• Daily total sunshine (how many hours of sunshine) is measured in hours and has a typical range from 0 to approximately 14 hours.
• Cloud cover (how much of the sky is covered in clouds) is measured in oktas with a typical range from 0 to 8. Oktas measure what fraction of the sky is covered
• Humidity (How much water vapour is in the air - above 95% is associated with fog) is measured in percent (%) and has a typical range from approximately 70% to 100%.
• Daily mean visibility (how far you can see) is measured in decametres (Dm) (1Dm = 10m) and has a typical range from approximately 200Dm to 4000Dm. Decametres are usually rounded to the nearest 100
• Daily mean pressure (How much the atmosphere is pressing down) is measured in hectopascals (hPa) and has a typical range from approximately 990 hPa to 1040 hPa
• 'tr' means there was a trace of water in the measuring instrument - it is used for values of rainfall, 0 < r ≤ 0.05

  We can clean data, which means replacing 'tr' with either 0 mm or 0.025 mm.
• If we have n/a in any of our data, we cannot use it. Cleaning it means to remove that entry.
• Daily mean windspeed (how windy it is) is measured in knots (kn) and has a typical range of approximately 3 kn to 10 kn.
• Windspeed can be converted by the Beaufort conversion, which changes the data from quantitative to qualitative.

  The typical range is from light to moderate ( but the scale includes Light, moderate, fresh then strong).

  Most days are ' light ' .
• Daily maximum gust (The strongest gust of wind that day) is measured in knots (kn) and has a typical range from approxiamtely 8 kn to 50 kn.
• Wind / gust direction (bearing) (which direction the wind is blowing from) is measured in degrees and has a typical range from 10 degrees to 360 degrees. It is measured in multiples of 10 only.
• Wind / gust direction (cardinal) is measured in compass directions

  It describes where the wind is blowing FROM not to .
• International Stations:

  1. Jacksonville , Florida , USA
  2. Beijing , China
  3. Perth , Australia
• Jacksonville has hot summers and hurricanes in October (but mean windspeed is still relatively low in our data).
• Beijing has hotter , wetter summers and colder winters
• Perth has flipped seasons
• The only international measurements (things being measured by international stations are:

  1. Daily mean temperature (warmer in summer, but Perth is colder)
  2. Daily total rainfall (Beijing is rainy in the summer)
  3. Daily mean pressure
  4. Daily mean windspeed (Now rounded to 1dp for international measurments)
  5. Windspeed, Beaufort conversion (Most days are 'light').