Opvallend is de negatieve uitschieter, in de laatste winter.
Winter (DJFM) NAO index
Year Index
1994/5 +2.44
1995/6 -2.32
1996/7 +0.18
1997/8 +0.80
1998/9 +0.98
1999/2000 +1.85
2000/1 -0.50
2001/2 +0.79
2002/3 +0.40
2003/4 -0.20
2004/5 -0.11
2005/6 -0.82
2006/7 +1.83
2007/8 +1.37
2008/9 -0.31
2009/10 -2.54
Bron: http://www.cru.uea.ac.uk/~timo/datapages/naoi.htm
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