This dataset contains a set of reference long term averages for observed climate variables that have been spatially averaged over a set of 14 administrative regions and 23 river basins across the British Isles (see links to maps and lists below). Where possible, reference climatologies for each of the periods 1961-1990, 1971-2000 and 1981-2010 are available for each variable. The availability of a variable for a given reference period was dependant on sufficient data for that variable within the reference period. Each regional value is an average of the 5km x 5km grid cell values that fall within it.

The data were derived from the Met Office gridded land surface climate observations – long term averages at 5km resolution (See related dataset) and are provided as space delimited text files.

The 14 administrative regions used within UKCP09 were:

- East Midlands

- East of England

- East Scotland

- London

- North East England

- North Scotland

- North West England

- Northern Ireland

- South East England

- South West England

- Wales

- West Midlands

- West Scotland

- Yorkshire & The Humber

The 23 river basin regions used within UKCP09 were:

- Anglian

- Argyll

- Clyde

- Dee

- Forth

- Humber

- Neagh Bann

- North East Scotland

- North Eastern Ireland

- North Highland

- North West England

- North Western Ireland

- Northumbria

- Orkney and Shetland

- Severn

- Solway

- South East England

- South West England

- Tay

- Thames

- Tweed

- West Highland

- Western Wales