Ferrell 06Z temperature 1980 - - - - - - - - - - - - 1981 - -13.8 -19.7 -34.2 -31.7 -29.7 -33.5 -35.4 -36.7 -26.0 -15.9 -6.5 1982 -6.2 -13.4 -29.7 -35.6 -35.3 -35.1 -40.0 -31.9 -35.7 -26.0 -14.4 -5.2 1983 -6.0 -16.0 -23.6 -24.4 -24.9 -36.2 -36.9 - - - - - 1984 -6.7 -14.6 -21.6 -24.7 -28.8 -30.0 -34.9 -34.6 -33.9 - - - 1985 - -16.0 -23.6 - -30.5 - -43.7 -36.7 -33.4 -25.0 - - 1986 - -11.7 -22.5 -28.7 -23.8 -30.7 -35.4 -42.6 -41.8 -24.1 -13.8 -6.6 1987 - -14.0 -27.0 -30.7 -30.3 -27.2 -31.4 -36.7 -31.2 -23.7 -14.3 -4.4 1988 -5.7 -13.8 -25.9 -27.7 -28.6 -29.8 - -25.9 -27.7 -20.3 -13.9 -5.4 1989 -5.1 -14.4 -21.7 -24.0 - - -32.6 - - -22.6 -12.2 -4.8 1990 -5.2 -14.6 -25.7 -28.0 -29.9 -35.4 -33.8 -39.1 -37.5 -25.8 -13.0 -5.9 1991 -6.5 -11.2 -25.6 -28.2 -31.8 -28.0 - - - - -14.0 -5.5 1992 -6.2 -15.3 -20.1 -32.8 -30.5 -33.1 -31.4 - - - - - 1993 - -12.3 -23.9 -27.2 -35.0 -29.7 -30.7 -38.2 -31.9 -27.0 -13.1 -6.7 1994 -4.8 -13.7 -26.7 -24.0 -35.9 -32.6 -31.8 -38.5 -37.9 -21.6 -10.8 -4.6 1995 -6.2 -12.0 -25.6 -33.4 -34.8 -30.2 -34.4 -32.9 -33.4 -23.3 -12.0 -3.6 1996 -4.8 -12.2 -25.4 -25.5 -31.6 -31.1 -34.4 -27.5 -29.4 -25.3 -12.4 -4.1 1997 -5.3 -14.6 -26.7 -34.5 -29.7 -29.1 -35.1 -40.3 -30.4 -17.9 -8.6 -5.2 1998 -5.5 -10.7 -23.3 -35.2 -30.0 -23.3 -34.1 - - - - - 1999 - -13.3 - - - - - - - - - - 2000 - - - - - - - - - - - - 2001 - -10.3 -25.2 -27.6 -30.6 -28.8 -27.7 -42.4 -32.2 -22.7 -11.7 -3.4 2002 -3.7 -11.8 -19.7 -27.9 -26.7 -35.3 -38.8 -38.6 -27.3 -20.9 -12.0 -5.3 2003 -2.9 -11.1 -21.9 -30.6 -25.8 -29.0 -27.8 -37.0 -31.0 -20.0 -13.0 -3.1 2004 -5.1 - -26.1 -27.7 -33.2 -30.0 -41.4 -39.9 -33.6 -23.4 - -2.3 2005 -2.4 -11.9 -24.2 -29.7 -25.2 -31.9 -32.2 -33.5 -30.6 -21.1 -10.9 -1.7 2006 -3.8 -9.4 -22.7 -32.2 -35.7 -27.4 -37.5 -25.6 -27.8 -23.1 -11.1 -4.6 2007 -2.0 -11.2 -22.1 -28.2 -26.6 -27.8 -29.7 -29.7 -26.5 -24.2 -11.2 -3.2 2008 -3.2 -12.9 -20.7 -26.1 -30.1 -23.5 -34.3 -42.1 -24.5 -20.0 -12.8 -2.6 2009 -3.4 -13.9 -24.6 -23.0 -32.8 -30.1 -30.6 -33.9 -32.5 -24.4 -8.4 -2.6 2010 -3.0 -10.7 -20.2 -25.5 -32.5 -33.0 -35.4 -34.4 -32.3 -21.5 -10.0 -3.7 2011 -4.5 -12.5 -21.1 -25.4 -27.1 -26.4 -25.4 -28.0 -29.8 -21.8 -9.1 -1.9 2012 -3.0 -9.3 -21.3 -27.0 -23.5 -33.7 -33.6 -34.7 -27.1 -20.5 -11.9 - 2013 -4.7 -13.1 -21.3 -33.1 -27.5 -31.3 -35.1 -35.0 -27.9 -21.4 -13.7 -5.2 2014 - - -23.4 -30.6 -26.6 -32.4 -39.0 -25.1 - - - - 2015 - -10.6 -23.4 -33.9 -32.6 -31.8 -34.9 -33.4 -34.9 -22.3 -14.3 -5.6 2016 -5.0 -12.7 -23.5 -31.5 -29.9 -33.6 -37.4 -32.6 -32.2 -23.9 -12.5 -6.2 2017 -5.4 -14.1 -21.5 -25.4 -22.7 -32.6 -32.5 -29.8 -34.9 -22.3 -15.0 -6.2 2018 -6.6 -13.2 -20.9 -26.8 -30.6 -27.8 -32.6 -35.0 -31.9 -18.2 -11.2 -5.1 2019 -6.1 -11.5 -20.5 -28.6 -25.8 -30.5 -28.1 -29.2 -28.1 -22.4 -11.7 -4.5 2020 -6.3 -9.9 -23.9 -30.2 -29.5 -31.9 -31.7 -30.7 -30.3 -21.4 -13.7 -5.7 2021 -5.6 -12.8 -22.8 -35.0 -31.1 -31.4 -27.2 -39.7 -31.0 -22.5 -12.3 -4.9 2022 -6.7 -10.7 -21.9 -28.2 -25.1 -31.8 -28.3 -33.0 -30.1 -22.8 -16.1 -5.3 2023 -6.0 -12.2 -25.1 -29.0 -30.9 -28.6 -39.7 -42.1 -23.4 -24.4 -14.3 -5.9 2024 -6.2 - -23.6 -26.6 -31.3 -27.0 -34.1 -29.1 -34.3 - - -