Lettau 00Z wind_speed 1986 - 9.2 6.3 10.4 10.5 11.2 9.4 8.1 7.1 9.3 3.6 7.8 1987 10.2 7.7 6.3 5.3 8.5 7.9 5.7 7.0 4.2 0.4 - 8.9 1988 9.3 7.7 8.2 9.7 8.2 10.4 9.8 13.7 7.4 12.0 6.0 7.8 1989 8.8 6.0 8.3 10.3 8.5 6.0 10.6 9.4 10.7 13.3 12.2 7.3 1990 7.5 5.5 7.8 8.5 6.0 11.6 7.4 9.4 7.9 9.2 7.3 10.8 1991 6.1 7.6 8.7 10.1 9.8 7.0 - - - - 8.1 8.3 1992 7.1 9.6 8.0 6.4 9.8 9.4 - - - - 9.1 8.1 1993 8.1 6.1 9.3 7.4 6.8 9.0 - - - - 7.8 5.0 1994 8.9 7.6 9.2 8.8 8.8 11.0 8.6 - - - 7.4 8.2 1995 7.0 8.5 7.4 6.2 7.2 12.1 - - - - 13.7 11.1 1996 8.7 - - - - - - - - - - 8.6 1997 - - - - - - - - - 10.4 - - 1998 - - 8.3 5.6 8.1 - - - - - - - 1999 - 7.2 6.4 7.2 8.7 6.9 11.1 - - 9.2 - - 2000 - - 8.6 9.8 9.0 10.0 12.8 8.7 10.5 - - - 2001 - - - - - 9.3 6.6 - - - - - 2002 - - - - - - - - - - - - 2003 - - - - - 5.9 - - - - - - 2004 - - - - - - - - - - - - 2005 - - 8.1 - 10.7 15.4 43.7 31.5 - 21.5 - - 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - -