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The World Meteorological Organization (WMO) requires the
calculation of averages for consecutive periods of 30 years,
with the latest covering the 1961-1990 period. However,
many WMO members, including the UK, update their averages
at the completion of each decade. Thirty years was chosen
as a period long enough to eliminate year-to-year variations.
These averages help to describe the climate and are used
as a base to which current conditions can be compared. Use
the links below to see a selection of station, district
and regional averages or contoured UK maps for a wide range
of weather elements.
How the averages were calculated
Download a description of the analysis methods used to generate
the long-term averages.
More about analysis
methods
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