Lettau 12Z temperature 1986 - -17.1 -27.9 -31.0 -25.0 -33.7 -40.0 -42.4 -48.1 -31.6 -17.4 -9.0 1987 -6.9 -19.6 -35.4 -38.0 -35.2 -29.7 -34.1 -39.0 -38.3 -27.4 -20.7 -7.2 1988 -8.0 -18.6 -31.6 -31.0 -33.6 -35.0 -36.2 -27.9 -34.6 -24.4 -19.3 -7.9 1989 -7.6 -20.9 -28.2 -28.8 -34.8 -45.6 -37.2 -38.4 -34.9 -28.3 -15.2 -6.6 1990 -8.2 -19.7 -30.2 -31.8 -35.3 -34.8 -41.0 -41.6 -41.7 -30.5 -17.4 -6.1 1991 -9.3 -16.0 -31.6 -30.5 -33.9 -32.1 -39.6 - - - -16.3 -6.9 1992 -7.6 -18.8 -22.5 -38.4 -29.6 -35.5 - - - - -17.6 -7.9 1993 -8.2 -18.5 -30.3 -32.3 -41.0 -31.9 - - - - -18.2 -11.7 1994 -10.2 -19.0 -33.6 -28.5 -42.8 -35.9 -34.4 -41.2 -46.6 -26.9 -16.7 -6.6 1995 -9.4 -17.2 -29.7 -37.0 -40.6 -30.3 - - - - -15.4 -6.7 1996 -7.5 - - - - - - - - - - -7.1 1997 -8.6 - - - - - - - - - - - 1998 - - -29.4 -41.2 -35.0 - - - - - - - 1999 - -19.9 -33.9 -39.7 -39.3 -38.1 -33.2 -42.1 -29.5 -26.2 - - 2000 - - -23.8 -31.1 -34.1 -34.9 -31.2 -37.0 -36.5 -31.0 - - 2001 - - -31.1 -30.6 -35.7 -31.3 -31.9 -48.6 -35.4 -28.2 - - 2002 - - -22.3 -33.5 -27.8 -41.7 -42.8 -40.6 -31.7 -26.8 - - 2003 - - - - - - -33.5 - - - - - 2004 - - - - - - - - - - - - 2005 - - -29.6 -37.6 -30.7 - -32.3 -38.8 -35.4 -26.4 - - 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - -