Climatic deviations always relate to a reference period that is assumed to be "normal". As it is well known that the weather and the weather conditions can change over a very short period of time and turn out slightly different every year, an average value over a longer period is necessary. A climatic average is therefore formed over a period of 30 years.
Different climatic periods are used depending on the perspective. The following figures show the average values of global temperatures, measured at a height of 2 meters, for the period 1981 to 2010.
|Weather observations||Extreme weather||Global temperatures||Current sunspots|
|Water temperature||Extreme heat||Troposphere||Annual solar activity|
|Storm glass||Extreme cold||Weather history||Solar activity since 1700|
|Station Niederlemp||Extreme storms||Climate of the decades||Historical solar activity|
|Station Ziegelhausen||Extreme rain||Climate anomalies||Predicting the sun activity|
|Wind scales||Tropopause||NAO Index||Solar irradiance|
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