UK TMY data

Typical Meteorological Year (TMY) Global Horizontal Irradiance data for Distribution Network Operator areas

The spreadsheets available for download below contain hourly TMY Global Horizontal Irradiance values generated from the 2005-2014 decade for each of 12 UK Distribution Network Operators. Global Horizontal Irradiance in Wh/m^2.


TMY East England

TMY East Midlands

TMY London

TMY North Wales, Merseyside and Cheshire

TMY West Midlands

TMY North East England

TMY North West England

TMY South East England

TMY Southern England

TMY South Wales

TMY South West England

TMY Yorkshire

NOTE: Data for 10km squares rather than Distribution Network Operator Areas is available here or for specific locations please e-mail us

Data preparation

The Global Horizontal Irradiance data is initially interpolated to each Distribution Network Operator area from UK Meteorological Office measured values. The TMY for each DNO is calculated as follows:

  1. For each month in the year (i.e., Jan., Feb., March, etc.), the ten-year monthly mean of irradiance data is obtained for the period 2004-2015.
  2. The historic month that most closely matches the ten-year mean for that month is identified i.e. the most “typical” month.
  3. The hourly data values from the twelve typical months are combined to create the typical year file. This might comprise e.g. January from 2010, February from 2005, March from 2007 etc.

This simple method has been shown to perform well compared to other free-to-download TMY datasets.

Data usage

If you make use of this data, please:

E-mail with details of your employer/institution and a brief description of the project for which you require the data.

Cite this journal paper in any publications.

Feel free to link this webpage and the journal papers to any relevant online resources.

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