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For what period of record do normal temperature and precipitation data come from?

April 26, 2017Data normal period precipitation record temperature

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For what period of record do normal temperature and precipitation data come from?

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Normal temperature and precipitation data are based on average values during the 30 year period 1971 to 2000. The values are based on a 30 years of data and are recomputed every 30 years. In the year 2010 they will again be recalculated based on the period 1981-2010. Due to the recent warm weather normal temperatures are slightly higher than those computed for the period 1961 to 1990.