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NAO Index

The North Atlantic Oscillation Index (NAO Index) describes the intensity of the west wind drift in the North Atlantic. The stronger the west wind drift the milder the winter in Europe. In the opposite case the weaker the west wind drift the stricter the winter in Europe.


NAO Index of the last 120 days

NAO Index of the last 120 days
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Daily values from 1950 to date

NAO Index since 1950, daily values
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Influence on the climate in Europe

The influence of the NAO Index on the weather in Central Europe is strongest during the winter months December to February. The following diagram shows the winter values since 1864.

NAO Index since 1864, winter values
(Click for a larger view)