Whitlock 12Z temperature 1982 - -7.8 -17.7 -24.2 -24.0 -25.6 -27.8 - -26.7 -20.6 -10.8 -4.8 1983 -4.1 -8.4 -14.3 -18.3 -17.9 -24.8 -28.8 -25.8 -24.0 -19.2 -11.9 -5.7 1984 -4.4 -8.2 -14.6 -19.6 -20.6 -24.1 -25.8 -26.0 -25.1 -18.3 -11.4 -5.3 1985 -4.0 -8.8 -14.5 -22.7 - -24.8 -30.5 -26.5 -25.5 -20.3 -12.9 -6.8 1986 -5.3 -7.7 -14.7 -21.5 -18.8 -24.3 -25.7 -29.2 -30.5 -19.9 -12.4 -6.4 1987 -3.8 -9.1 -17.0 -22.8 -23.5 -20.1 -25.2 -26.9 -24.1 -18.4 -12.6 -5.2 1988 -4.5 -8.4 -16.5 -19.3 -21.8 -21.6 -26.0 -20.8 -22.0 -15.5 -12.0 -6.0 1989 -4.9 -8.6 -14.1 -18.6 -25.1 -28.7 -25.0 -26.9 -23.3 -18.8 -11.3 -5.1 1990 -4.2 -8.2 -15.8 -22.0 -22.7 -25.7 -23.3 -28.2 -28.3 -20.2 -10.8 -5.0 1991 -4.6 -6.2 -16.1 -21.2 -24.5 -21.0 -25.2 -24.7 -22.4 -19.0 -11.8 -5.0 1992 - - - - - - - - - - - - 1993 -4.5 -8.1 -15.9 -22.3 - - - - - -21.6 - - 1994 - - -20.0 -19.2 -27.8 -24.4 -24.0 -29.3 -26.4 -18.2 -11.0 -6.0 1995 -6.1 -8.6 -18.0 -24.7 -26.9 -26.0 -25.8 -25.4 -26.2 -19.9 -11.3 -4.5 1996 -5.4 -7.9 -14.0 -19.1 -26.0 -25.4 -27.3 - - -22.4 -11.6 -5.2 1997 -5.4 -9.7 -19.0 -25.9 -25.1 -22.6 - - - - -8.2 -6.1 1998 -6.0 -8.9 -19.8 - - - - - - - - - 1999 - - - - - - - - - - - - 2000 - - - - - - - - - - - - 2001 - - -17.9 -22.5 -23.4 -22.2 -24.6 -30.7 -25.1 -19.4 -11.8 -4.3 2002 -3.9 -8.6 -14.9 -21.7 -20.5 -26.4 -28.7 -30.0 -22.2 -19.3 -12.4 -7.4 2003 - -9.8 - - - - - - - - - -4.9 2004 -5.8 -9.0 -20.0 -23.2 -26.0 -22.3 -31.6 -27.4 -25.1 -19.5 -9.7 -3.7 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - - 2010 - - - - - - - - - - - - 2011 - -7.7 -14.9 -21.1 -22.3 -22.0 -20.4 -21.3 -22.3 -19.5 -8.7 -5.3 2012 -5.1 -7.5 -15.2 -20.9 -18.4 -24.1 -26.4 -24.7 -23.1 -18.1 -10.3 -3.9 2013 -3.8 -8.1 -15.2 -24.2 -20.1 -23.2 -27.8 -25.4 -20.4 -17.6 -11.5 -3.8 2014 -2.5 -7.6 -16.0 -22.6 -20.4 -25.9 -28.7 -21.0 -19.4 -16.7 -11.4 -5.9 2015 -3.9 -6.2 -15.9 -24.6 -24.7 -24.5 -26.7 -25.8 -27.2 -17.9 -11.4 -3.5 2016 -3.9 -7.2 -15.0 -23.2 -23.4 -26.6 -28.6 -24.5 -24.7 -19.0 -9.4 -4.9 2017 -3.6 -7.5 -13.6 -20.5 -19.3 -25.1 -25.3 -23.7 -26.6 -17.6 -12.0 -5.8 2018 -4.5 -8.8 -13.4 -20.4 -23.9 -21.2 -24.1 -25.5 -24.2 -16.0 -9.5 -5.1 2019 -4.3 -7.1 -12.8 -20.7 -19.6 -24.4 -20.7 -22.8 -23.1 -18.1 -8.9 -4.5 2020 -3.6 -5.7 -14.5 -21.7 -23.3 -24.0 -22.6 -24.0 -23.1 -18.4 -11.2 -4.0 2021 -3.9 -6.9 -12.5 -24.6 -24.1 -23.6 -20.0 -27.7 -22.4 -17.2 -9.9 -3.7 2022 -3.5 -6.2 -13.0 -21.7 -19.3 -22.2 -23.1 -24.1 -23.8 -18.3 -12.9 -5.9 2023 -5.6 -8.9 -17.6 -20.7 -24.4 -22.8 -29.6 -31.7 -19.5 -20.3 -11.0 -4.8 2024 -4.5 -8.9 -16.4 -20.6 -23.9 -23.1 -24.4 -21.7 -25.6 - - -