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Total cloud

'Total cloud' cover refers to the fraction of the sky obscured by clouds when observed from a particular location. Total cloud cover is often expressed as a percentage. 

In detail

The UKCP09 projections provide information on the 30-year average of monthly, seasonal and annual total cloud cover.

Total cloud cover is one of the climate variables provided by UKCP09 over land areas, measured in per cent (%). Projected changes in seasonal relative humidity for the UK as a whole are available on the UKCP09 website in the form of .

Find out more


  • A complete list of climate variables for which probabilistic projections are available is given in the UKCP09 Climate Change Projections report -  for projections over land and  for projections over marine regions.