Lettau 12Z wind_speed 1986 - 6.8 6.1 9.4 10.8 10.3 9.7 8.4 6.8 8.9 4.2 5.9 1987 7.3 5.7 5.2 5.1 8.7 8.8 6.3 7.4 4.8 0.2 - 7.9 1988 8.1 6.0 9.0 8.8 7.8 10.2 9.0 14.1 7.9 12.8 4.1 6.2 1989 7.6 5.3 7.2 8.2 8.4 6.0 8.6 10.5 11.0 11.4 11.5 6.1 1990 6.7 5.5 6.2 9.0 6.5 11.7 6.8 9.1 8.3 8.2 6.8 10.1 1991 5.2 6.2 8.7 8.9 8.9 8.0 7.1 - - - 8.6 7.1 1992 5.8 7.7 8.2 6.6 8.0 9.0 - - - - 7.4 5.8 1993 6.1 6.7 8.1 7.7 6.5 9.0 - - - - 6.7 3.8 1994 6.9 6.3 7.4 8.1 8.3 8.4 7.8 - - - 6.1 6.3 1995 5.1 7.9 6.9 7.2 7.5 11.2 - - - - 11.8 7.9 1996 7.6 - - - - - - - - - - 7.1 1997 5.6 - - - - - - - - - - - 1998 - - 8.4 5.8 10.0 - - - - - - - 1999 - 6.6 6.5 7.3 8.1 7.1 10.8 - - 9.5 - - 2000 - - 9.0 10.3 8.0 11.8 13.2 7.5 10.8 - - - 2001 - - - - - 9.7 8.3 - - - - - 2002 - - - - - - - - - - - - 2003 - - - - - - 10.1 - - - - - 2004 - - - - - - - - - - - - 2005 - - - 26.7 11.7 - - 29.9 5.7 22.8 - - 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - -