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UKCP09: Monthly data sets

Monthly gridded data sets at 5 x 5 km resolution are available for 16 variables. The list of available variables is given below, together with a definition for each variable.

Monthly data sets

Climate variable Definition First year available Last year available
Mean daily maximum temperature Average of the daily highest air temperatures from 0900-0900 (°C) 1910 2011
Mean daily minimum temperature Average of the daily lowest air temperatures from 0900-0900 (°C) 1910 2011
Mean air temperature Average of mean daily maximum and mean daily minimum temperatures (°C) 1910 2011
Days of air frost Count of days when the air minimum temperature is below 0 °C 1961 2011
Days of ground frost Count of days when the grass minimum temperature is below 0 °C 1961 2011
Sunshine duration Duration of bright sunshine during the month (hours per day) 1929 2011
Total precipitation Total precipitation amount (mm) during the month 1910 2011
Days of rain ≥1 mm Number of days with ≥1 mm precipitation (0900-0900) 1961 2011
Days of rain ≥10 mm Number of days with ≥10 mm precipitation (0900-0900) 1961 2011
Days of sleet or snow falling Number of days with sleet or snow falling 1971 2011
Days of snow lying Number of days with greater than 50% of the ground covered by snow at 0900 1971 2011
Mean wind speed at 10 m Hourly mean wind speed (knots) at a height of 10 m above ground level averaged over the month 1969 2011
Mean sea-level pressure Hourly (or 3-hourly) mean sea-level pressure (hPa) averaged over the month 1961 2011
Mean relative humidity Hourly (or 3-hourly) relative humidity (%) averaged over the month 1961 2011
Mean vapour pressure Hourly (or 3-hourly) vapour pressure (hPa) averaged over the month 1961 2011
Mean cloud cover Hourly (or 3-hourly) total cloud cover (%) averaged over the month 1961 2006

The monthly data sets are available in two formats.

  • A grid for each month covering the whole of the UK, downloadable in multi-year blocks, as space-delimited text files
  • As a time series of values by grid point, downloadable in multi-year blocks covering the whole of the UK, as comma-delimited text files

Related internet links

Department for Environment, Food and Rural Affairs (Defra)

UK Climate Impacts Programme (UKCIP)

The Met Office is not responsible for the content of external internet sites.

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