Ferrell 00Z temperature 1981 - -14.1 -19.6 - -31.2 -29.8 -33.0 -36.4 -36.8 -25.3 -15.8 -6.8 1982 -6.4 -12.6 -29.4 -36.0 -36.2 -34.6 - -31.4 -35.7 -25.4 -14.7 -5.1 1983 -6.2 -16.7 -24.5 -23.8 -24.2 -35.0 -36.2 - - - - - 1984 -7.4 -15.1 -22.1 -25.4 -27.6 -30.5 -33.3 - -33.7 - - - 1985 - -16.2 -23.1 -32.6 - - -43.6 -37.1 -33.2 -25.6 - - 1986 - -12.3 -22.3 -28.8 -23.5 -31.3 -35.9 -41.5 -40.7 -24.1 -13.4 -6.5 1987 - -14.2 -26.6 -31.3 -30.6 -27.8 -32.1 -36.0 -30.7 -23.7 - -5.0 1988 -6.2 -13.3 -26.0 -27.6 -28.1 -29.1 - -25.1 -27.1 -19.2 - -5.3 1989 -5.3 -13.7 -21.8 - - - - - - -21.2 -12.2 -4.9 1990 -6.0 -15.3 -25.9 -27.8 -29.6 -35.0 -33.1 -38.6 -36.6 -25.6 -12.6 -6.2 1991 -7.0 -11.1 -25.7 -27.6 -32.8 -26.2 - - - - -13.8 -6.2 1992 -5.9 -15.5 -20.0 -32.5 -30.7 -32.6 -29.4 - - - - - 1993 - -12.9 -23.4 -27.2 -34.1 -29.3 -30.8 -38.2 -31.5 -27.1 -12.8 -6.3 1994 -5.6 -14.1 -27.2 -23.9 -36.3 -32.6 -32.4 -39.2 -37.8 -21.3 -11.7 -5.0 1995 -6.1 -11.5 -25.5 -32.4 -34.3 -30.2 -34.5 -32.9 -32.8 -23.6 -12.1 -4.3 1996 -5.3 -12.1 -24.8 -24.7 -31.4 -31.7 -35.0 -28.6 -29.1 -25.2 -12.3 -4.8 1997 -5.5 -14.7 -27.5 -33.7 -31.3 -28.7 -35.7 -39.9 -30.6 -18.4 -9.1 -5.0 1998 -5.4 -10.3 -23.0 -35.3 -29.8 -24.0 -34.4 - - - - - 1999 - -12.7 - - - - - - - - - - 2000 - - - - - - - - - - - - 2001 - -10.8 -24.3 -28.2 -31.0 -28.0 -28.2 -41.7 -31.1 -23.2 -12.6 -4.0 2002 -3.3 -11.8 -18.8 -26.7 -26.5 -35.6 -39.7 -38.0 -26.4 -20.1 -11.4 -5.1 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - -11.4 -4.4 2007 -2.4 -11.0 -20.8 -28.2 -26.5 -27.1 -29.7 -29.9 -26.5 -23.9 -11.0 -3.4 2008 -3.7 -13.0 -19.6 -26.2 -30.2 -23.6 -34.9 -40.5 -24.9 -19.4 - - 2009 - - - - - - - - - - - -