"The Finnish Meteorological Institute among many other meteorological institutes throughout Europe has published a new climatological 30-year summary concerning the period of 1971-2000. The need of updated climatological 30-year statistics was obvious already in the end on 20th century. However, the former period 1961-1990 will still remain the official normal period defined by WMO. The next official normal period is 1991-2020 but until then we probably see the statistics for the period 1981-2010 as well as we now see for the period 1971-2000."
