Ferrell 00Z temperature 1980 - - - - - - - - - - - - 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 -2.6 -10.5 -21.8 -30.2 -26.8 -29.3 -28.5 -37.1 -30.6 -19.8 -13.1 -3.4 2004 - - -25.7 -27.1 -34.3 -31.5 -41.0 -39.5 -32.5 -23.4 - -3.1 2005 -3.1 -12.1 -23.7 -28.7 -25.1 -32.2 -31.2 -32.9 -30.2 -20.3 -11.1 -2.0 2006 -4.4 -9.4 -22.0 -31.9 -35.8 -28.1 -36.9 -24.9 -27.4 -23.1 -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 -13.4 -3.3 2009 -3.5 -13.4 -24.1 -22.5 -32.1 -30.8 -30.7 -34.5 -31.9 -24.0 -8.4 -3.4 2010 -3.0 -10.7 -20.7 -26.1 -32.9 -32.9 -34.0 -34.7 -33.0 -21.4 -10.4 -3.7 2011 -3.9 -12.7 -20.3 -25.7 -29.3 -26.8 -25.6 -27.9 -28.6 -20.9 -9.2 -2.8 2012 -3.4 -9.2 -21.1 -26.4 -23.2 -34.2 -33.9 -33.1 -27.0 -19.7 -11.6 - 2013 -5.2 -13.5 -20.9 -32.8 -26.8 -31.5 -35.2 -35.2 -28.2 -21.9 -14.5 -5.4 2014 - - -23.1 -30.7 -26.7 -32.6 -39.7 -25.4 - - - - 2015 - -10.9 -23.2 -33.6 -32.8 -31.8 -35.3 -32.6 -34.3 -22.7 -14.4 -5.8 2016 -5.1 -13.7 -23.4 -30.9 -31.0 -34.3 -37.4 -33.9 -32.3 -24.0 -13.4 -6.5 2017 -5.5 -14.5 -21.5 -25.2 -23.1 -30.7 -32.6 -29.7 -34.4 -21.9 -15.3 -6.4 2018 -6.6 -13.5 -20.7 -27.5 -31.4 -27.4 -34.1 -35.3 -31.7 -18.3 -11.4 -5.4 2019 -6.3 -11.8 -20.8 -29.1 -26.6 -30.5 -27.9 -29.2 -27.9 -22.0 -12.2 -4.3 2020 -6.4 -10.0 -23.8 -30.0 -28.8 -30.4 -30.8 -31.0 -30.4 -21.5 -14.2 -6.2 2021 -5.9 -12.9 -22.2 -35.6 -30.3 -30.9 -26.8 -39.1 -30.5 -22.2 -12.4 -5.5 2022 -6.9 -11.3 -21.9 -26.8 -24.4 -32.0 -28.3 -31.9 -30.0 -23.4 -16.5 -5.5 2023 -6.4 -12.9 -24.7 -28.5 -32.0 -28.2 -38.8 -42.3 -23.4 -24.4 -14.4 -6.3 2024 -6.5 - - -25.7 -31.5 -26.9 -34.4 -28.7 -34.7 -20.1 -15.4 -