UKCP09: Gridded datasets of annual values. Summer heatwave duration. The day-by-day sum of the mean number of degrees by which the air temperature is more than a value of 22 °C Sum of days with daily maximum temperature more than 3 °C above 1961–90 daily normal for ≥5 consecutive days (May–Oct).
The datasets have been created with financial support from the Department for Environment, Food and Rural Affairs (Defra) and they are being promoted by the UK Climate Impacts Programme (UKCIP) as part of the UK Climate Projections (UKCP09). http://ukclimateprojections.defra.gov.uk/content/view/12/689/.
