Ferrell temperature 1981 - -14.9 -20.5 -33.7 -31.4 -29.6 -33.4 -36.4 -37.6 -27.4 -17.7 -8.0 1982 -7.6 -14.3 -30.4 -35.7 -35.8 -35.2 -39.4 -31.7 -36.1 -27.1 -15.8 -6.7 1983 -7.7 -18.1 -24.6 -23.7 -24.6 -36.4 -36.7 - - - - - 1984 -8.7 -16.0 -22.6 -25.0 -28.4 -30.4 -34.7 -36.1 -34.4 - - - 1985 - -17.6 -24.0 -32.5 - - -43.3 -37.3 -33.7 -26.2 - - 1986 - -13.8 -23.0 -28.6 -24.1 -31.3 -35.1 -41.5 -42.1 -26.0 -15.2 -8.1 1987 - -15.8 -27.6 -31.5 -30.2 -27.8 -32.1 -36.0 -31.0 -25.7 -17.1 -6.2 1988 -7.5 -15.1 -26.9 -27.6 -28.4 -29.1 - -25.3 -27.6 -21.0 -15.3 -6.6 1989 -6.4 -16.0 -22.4 - - - - - - -22.8 -13.2 -6.4 1990 -7.4 -16.3 -26.6 -28.0 -29.6 -35.0 -34.1 -38.7 -37.8 -27.3 -15.0 -7.2 1991 -8.5 -12.2 -26.6 -28.0 -32.4 -27.5 - - - - -15.4 -6.9 1992 -7.7 -16.6 -20.4 -32.9 -30.0 -33.4 -30.6 - - - - - 1993 - -14.2 -24.6 -27.3 -34.7 -29.3 -31.0 -38.2 -32.4 -28.7 -14.4 -8.4 1994 -7.4 -15.6 -28.1 -24.2 -35.8 -32.6 -32.3 -38.3 -38.7 -22.8 -13.0 -6.4 1995 -7.7 -13.6 -26.6 -33.7 -34.7 -30.3 -35.0 -33.2 -33.3 -25.4 -13.8 -5.5 1996 -6.5 -14.5 -26.5 -25.3 -31.2 -31.7 -34.6 -28.1 -30.5 -27.0 -14.2 -5.9 1997 -6.9 -16.5 -28.2 -34.1 -30.4 -29.0 -35.3 -40.4 -30.9 -19.4 -9.8 -6.1 1998 -7.5 -11.5 -24.1 -35.8 -29.8 -23.9 -34.6 - - - - - 1999 - -14.7 - - - - - - - - - - 2000 - - - - - - - - - - - - 2001 - -12.5 -26.3 -27.7 -31.4 -27.9 -28.3 -41.9 -31.9 -24.8 -14.1 -5.5 2002 -5.6 -14.2 -20.4 -28.1 -26.7 -35.6 -38.7 -38.2 -27.6 -21.7 -13.4 -7.0 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - -13.1 -6.3 2007 -3.8 -12.5 -22.0 -28.0 -26.6 -27.9 -29.6 -29.8 -27.3 -25.6 -12.6 -5.0 2008 -4.9 -14.6 -21.1 -26.3 -30.0 -23.5 -34.4 -41.5 -24.9 -21.1 - - 2009 - - - - - - - - - - - -