D_10 12Z temperature 1980 - -6.7 -9.5 -14.6 -17.3 -18.6 -14.1 -17.7 -13.9 -18.2 -8.4 -3.8 1981 - -6.7 -11.9 -13.1 - - - - - - - - 1982 - - -13.7 -17.5 -13.5 -13.9 -17.0 -25.5 -20.5 - - - 1983 -2.5 -6.0 -13.6 -16.2 -15.3 -15.6 -22.8 -20.6 -15.5 -19.0 -10.8 - 1984 - -6.7 -9.2 -16.4 -13.7 -20.1 -20.3 -14.9 -15.8 -15.5 -10.6 -2.3 1985 - -7.3 -12.2 -17.6 - -18.2 -19.2 -17.0 -20.0 -17.2 -11.1 -5.5 1986 -4.2 -4.4 -9.7 - -18.8 -18.5 -19.0 -16.0 - - - -5.1 1987 -2.5 -6.8 -12.7 -16.4 -19.5 -13.4 -18.7 -21.2 -17.1 - - -5.1 1988 -3.5 -7.9 -14.6 -15.0 -18.0 -19.6 -18.9 -21.2 -16.9 -14.2 -10.9 -5.1 1989 -6.2 -8.8 -14.4 -14.9 -18.1 -23.3 -17.2 -18.6 -15.0 -14.5 -11.2 -3.3 1990 -3.4 -8.6 -14.4 -15.6 -17.2 -20.7 -12.8 -20.0 -19.7 - - - 1991 - - -11.4 -12.6 -18.1 -13.7 -19.3 -14.0 -17.0 -15.3 -9.0 -2.3 1992 -3.0 -6.2 -11.0 -14.0 -18.0 -14.5 -17.1 -12.5 -18.7 -18.0 -8.7 -6.4 1993 -1.7 -6.3 - - - - - - - -15.6 -9.4 -4.3 1994 -4.3 -8.2 -13.3 -16.0 -21.4 - - - -14.8 -14.6 -9.6 -5.1 1995 -5.1 -7.5 -10.2 -12.7 -17.7 - - - - - - - 1996 - - - - - - - - - - - - 1997 - - - - - - - - - - - - 1998 - -6.0 -13.7 -16.6 -16.9 -19.6 - - -18.3 - - - 1999 -6.6 -9.1 -14.5 -18.7 -20.6 - - - -19.9 -15.2 -11.0 -7.3 2000 -6.8 -9.4 -12.7 -20.4 -17.1 -18.7 - - - - - -4.7 2001 -3.3 -8.7 -11.5 -16.8 -16.5 -17.6 - - - -14.8 - -5.3 2002 -3.9 -7.8 -11.0 -15.9 -16.5 -14.9 - -19.3 -17.6 -16.3 -10.2 -5.1 2003 -4.0 - - - - - - -18.4 -17.4 -17.3 -11.4 -4.2 2004 -2.8 -6.2 -12.4 - - -14.9 - - - - - - 2005 - - - - - - - - -17.0 -13.9 - - 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - -14.9 -16.4 -16.9 -20.7 -21.2 -17.1 -18.5 -18.0 -9.7 -4.8 2009 -4.1 -8.4 -14.5 -18.5 -17.5 -17.8 -14.1 -17.5 -16.7 -18.0 -10.7 -4.8 2010 -1.5 -8.2 -13.5 -18.3 -18.4 -20.3 -22.0 -19.2 -23.2 -15.6 -10.2 -4.9 2011 -3.4 -9.9 -13.3 -15.3 -19.7 -19.1 -20.7 -19.4 -17.5 -16.3 -9.8 -5.0 2012 -5.6 -9.0 -14.0 -17.9 -17.5 -18.7 -21.5 -17.9 -20.2 -17.5 -10.3 -4.9 2013 -4.4 -10.4 -14.7 -19.6 -18.7 -19.8 -23.0 -18.8 -15.0 -15.8 - - 2014 - -8.1 -13.9 - - - - - - - - - 2015 - - - - - - - - - - - - 2016 - - - - - - - - - - - - 2017 - - - - - - - - - - - - 2018 -3.4 -7.5 -13.2 -11.9 -20.0 -21.2 -17.7 -19.0 -19.9 -16.8 -9.8 -5.0 2019 -4.3 -8.0 -13.5 -19.5 -22.8 -23.1 -18.3 -21.5 -21.2 -17.1 -8.7 - 2020 -3.1 -8.1 -14.4 -13.0 -18.4 -19.8 -15.9 -20.4 -18.4 -16.6 -10.1 -4.0 2021 -4.3 -9.5 -13.4 -19.1 -20.5 -18.5 -20.3 -15.0 -17.9 -13.6 -10.9 -5.7 2022 -5.0 -6.9 -11.6 -16.8 -17.1 -18.2 -17.0 -20.8 -16.6 -13.9 -10.4 -5.5 2023 -5.5 -6.9 -10.7 -13.6 -18.5 -17.4 -19.2 - - - - - 2024 - - - - - - - - - - - -