Marsh 18Z temperature 1987 - - - - - - - - - - - - 1988 - - - - - - - - - -2.8 -1.1 - 1989 - - - -4.5 - - -0.7 - -2.2 -0.5 0.5 1.7 1990 - - - -4.4 -4.7 - - - -2.4 - - - 1991 2.7 - - -2.4 - - - - - - - - 1992 - - - - - - - - - - - - 1993 - - - - - - - - - -1.7 0.1 - 1994 2.5 - - -1.3 - - -11.0 -4.0 - -5.2 - - 1995 - - - -1.0 - -6.6 -12.4 -10.3 - -1.2 -0.8 - 1996 - 2.0 1.1 - -3.3 - -3.8 -4.5 -2.4 -2.1 - - 1997 2.3 - 1.4 -1.6 -1.5 - - - -6.3 -3.0 - - 1998 2.4 - 1.1 0.7 -1.7 -1.2 -5.3 -6.5 -8.0 -2.0 -0.9 0.4 1999 1.7 1.4 1.4 0.5 - -4.0 -3.8 -5.1 -5.3 -1.6 0.2 1.3 2000 1.9 2.1 1.0 - - -2.1 -3.2 -6.3 -5.5 -1.9 -1.0 0.5 2001 1.6 0.5 - -3.1 -1.3 -4.8 -6.5 -2.7 -2.3 -0.8 -0.1 - 2002 - 2.4 0.1 - -5.9 -8.7 -6.7 -3.9 -2.8 -5.5 -1.2 0.6 2003 2.1 2.0 0.1 -0.1 -2.3 -7.4 -5.6 - - -2.0 -1.7 -0.7 2004 1.8 1.8 1.2 - -2.7 -2.9 -3.5 -4.0 -4.4 - - 0.9 2005 1.5 2.4 0.8 -1.1 -3.6 -8.0 -6.1 -4.3 -1.9 -1.2 -0.2 0.4 2006 - - 2.6 -0.2 -0.9 - -4.2 -7.5 -4.3 - -0.6 1.1 2007 1.7 2.1 -0.5 -3.8 - - -12.4 -5.4 -3.4 -4.0 -1.3 0.5 2008 1.2 2.1 0.5 -1.9 -2.1 -3.6 -3.6 -4.4 -1.3 - 0.0 1.3 2009 2.4 - - - - - - - - - - -