NAO Index for the period 1823 - 2002 (see sub-indicator for seasonal values for the years 1993 - 2002)
A positive index means mild and rainy winters in mid and northern Europe and relatively dry winters in southern Europe. A negative index leads to cold and dry winters in mid and northern and moist winters in southern Europe.
For references, please go to http://www.eea.europa.eu/data-and-maps/figures/nao-index-for-the-period-1823-2002-see-sub-indicator-for-seasonal-values-for-the-years-1993-2002 or scan the QR code.
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