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Why is the period 1961 to 1990 used for the long-term averages?

April 26, 2017averages long-term Used

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Why is the period 1961 to 1990 used for the long-term averages?

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The 30-year period 1961 to 1990 has been designated as the international standard reference period for climate averages by the World Meteorological Organization. Averages for the period 1971 to 2000 have also been produced for the UK, but the earlier period has been chosen for the UKCIP grids as it represents a better baseline for placing recent climate change into context.