Marilyn 12Z temperature 1987 - -19.5 -28.8 -31.2 -28.5 - - - - - - -7.9 1988 -9.2 -18.7 -28.0 -28.2 -27.4 - -32.2 - - - - - 1989 - -19.7 -24.3 - - -34.6 -30.5 -34.2 - - - - 1990 - -15.9 -20.3 - - -29.4 - - - - - - 1991 - -13.7 -28.7 -26.6 -31.4 -26.9 -34.3 -33.7 -27.5 -26.2 -17.6 -6.7 1992 -8.3 -20.2 -23.9 -31.6 -27.2 -33.2 -28.6 -33.8 -32.6 -26.0 -18.1 -8.6 1993 -9.9 -19.1 -27.3 -27.0 - - -29.3 -36.0 -32.0 -30.4 -16.2 -12.0 1994 -9.6 -19.2 -29.8 -24.0 -37.7 -30.7 -32.0 -34.9 -37.2 -23.8 -14.8 -8.9 1995 -9.9 -16.5 -28.0 -31.7 -36.2 - - - - - -15.3 -7.6 1996 -8.7 -17.3 -26.7 -23.1 -31.8 -31.4 -33.9 -27.3 -29.7 -28.2 -15.1 -7.0 1997 -8.6 -20.7 -29.4 -30.5 -29.6 -29.8 -35.8 -35.5 -29.8 -21.8 -12.2 -8.8 1998 -11.2 -13.9 -26.1 -32.4 -31.0 -23.7 -32.4 -32.3 -35.5 -25.3 -18.0 -9.4 1999 -7.0 -18.5 -27.4 -34.3 -32.7 -32.4 -28.3 -36.2 -26.0 -23.4 -14.0 -9.9 2000 -10.1 -17.6 -23.7 -26.4 -28.7 -31.5 -30.2 - - - - - 2001 - -13.8 -28.3 -27.3 -30.6 -27.3 -29.2 -39.5 -28.0 -27.2 -16.1 -7.3 2002 -6.5 -16.5 -22.3 -27.1 -26.0 -35.8 -36.4 -35.2 -27.7 -23.8 -15.9 -8.9 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - -