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UKCP09: Annual data sets

Annual gridded data sets at 5 x 5 km resolution are available for 12 variables. The list of variables and their definitions is given below.

Annual data sets

Climate variable Definition First year Last year
Heating degree days The day-by-day sum of the mean number of degrees by which the air temperature is less than a value of 15.5 °C (see FAQ 7 for further details). 1961 2006
Cooling degree days The day-by-day sum of the mean number of degrees by which the air temperature is more than a value of 22 °C (see FAQ 7 for further details). 1961 2006
Growing degree days The day-by-day sum of the mean number of degrees by which the air temperature is more than a value of 5.5 °C (see FAQ 7 for further details). 1961 2006
Extreme temperature range Annual maximum temperature minus annual minimum temperature 1961 2003
Growing season length Period bounded by daily mean temperature >5 °C for >5 consecutive days and daily mean temperature <5 °C for >5 consecutive days (after 1 July) 1961 2003
Summer 'heatwave' duration Sum of days with daily maximum temperature more than 3 °C above 1961–90 daily normal for ≥5 consecutive days (May–Oct) 1961 2003
Winter 'heatwave' duration As summer heat wave but for Nov–Apr 1961 2003
Summer 'cold wave' duration Sum of days with daily minimum temperature more than 3 °C below 1961–90 daily normal for ≥5 consecutive days (May–Oct) 1961 2003
Winter 'cold wave' duration As summer cold wave, but for Nov–Apr 1961 2003
Maximum number of consecutive dry days Longest spell of consecutive days with precipitation ≤0.2 mm during the year 1961 2004
Greatest 5-day precipitation total Greatest total precipitation amount (mm) for 5 consecutive days during the year 1961 2004
Rainfall intensity Total precipitation on days with ≥1 mm divided by count of days with ≥1 mm during the year 1961 2004

The annual data sets are available in two formats.

  • A grid for each year covering the whole of the UK, downloadable as a single block for the whole period, as space-delimited text files
  • As a time series of values by grid point, downloadable as a single comma-delimited text file covering the whole of the UK

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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