Lettau 06Z wind_speed 1986 - 7.6 6.5 9.7 11.0 9.9 9.9 7.5 7.1 9.4 3.8 6.1 1987 8.7 6.7 6.3 5.5 7.7 7.6 5.5 7.8 5.1 0.0 - 7.7 1988 7.7 6.3 8.4 9.7 7.9 10.5 9.8 12.4 7.3 12.9 5.4 6.3 1989 7.6 5.5 8.2 9.7 9.5 5.8 8.4 9.4 11.0 11.4 11.7 6.4 1990 6.9 5.3 7.5 8.7 5.8 11.2 6.6 9.0 7.9 7.8 6.3 10.6 1991 5.7 6.3 8.6 9.6 9.5 6.8 5.9 - - - 8.1 6.9 1992 6.5 8.3 7.2 6.9 10.1 9.0 - - - - 8.8 6.5 1993 6.4 5.8 9.5 7.2 6.1 - - - - - 7.1 4.4 1994 7.7 5.9 9.0 7.6 8.3 10.6 8.0 - - - 7.1 7.0 1995 5.6 8.2 7.1 6.8 7.9 12.2 - - - - 11.2 8.8 1996 8.4 - - - - - - - - - - 7.5 1997 - - - - - - - - - - - - 1998 - - 8.4 6.3 10.7 - - - - - - - 1999 - - 6.2 8.2 8.4 6.5 11.2 - - 8.1 - - 2000 - - 8.6 9.9 9.0 9.8 11.2 8.2 11.1 - - - 2001 - - - - - 10.8 8.1 - - - - - 2002 - - - - - - - - - - - - 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - 8.4 28.0 8.8 - 35.6 33.0 - 22.2 - - 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - -