(1) |
The World Meteorological Organization (WMO)
defines climatological standard normals as averages of climatological
data computed for the following consecutive periods of 30
years: 1 January 1901 to 31 December 1930, 1 January 1931
to 31 December 1960,
1 January 1961 to 31 December 1990, 1 January 1991 to 31 December
2020 etc. |