WINTER AND SUMMER TEMPERATURES IN BERLIN SINCE 1929 AND THEIR RELATIONSHIP WITH THE NORTH-ATLANTIC OSCILLATION (NAG)

As the investigation shows there exists a direct relationship between the mean winter temperatures in Berlin and the intensity of the circul ation over the North Atlantic Ocean. The correlation coefficient betwe en winter temperatures (Dec.-Feb.) and NAO amounts to 0.65 and 0.71 fo r the winter half-year (Oct.-Mar.). Both values are significant on the 99.9 %-level. The correlation coefficient between summer temperatures (June-Aug.) and NAO is much weaker. The values are only 0.13 and 0.24 for the summer half-pear (Apr.-Sep.), respectively. Furthermore a rem arkable increase of the NAO occurs for winter and spring since several decades, but no increase is observed for summer and fall. The number of storms over the Northern Atlantic is also significantly correlated to the NAG.