D_10 temperature 1980 - -6.5 -9.1 -14.5 -17.4 - -14.3 -17.7 -13.6 -17.1 -8.1 - 1981 - -6.3 - -13.1 - - - - - - - - 1982 - - -13.1 -17.4 -13.6 -14.2 -17.1 -25.0 -19.9 - - - 1983 -2.3 -5.6 -13.2 -16.0 -15.5 -15.5 -22.7 - -15.5 -18.3 -10.1 - 1984 - -6.2 -8.7 -16.0 -13.8 - -20.2 -15.1 -15.6 -14.4 -9.5 - 1985 - -6.8 -11.5 - - -18.5 - -16.9 - -16.4 - - 1986 -3.5 -4.4 -8.9 - -19.0 -18.5 -19.2 -15.9 - - - -4.2 1987 -2.0 -6.2 -12.0 -16.3 -19.4 -13.8 -18.7 -21.1 -17.1 - - -4.4 1988 -3.2 -7.5 -14.0 -14.7 -18.2 -19.5 -19.1 -20.5 -16.3 -13.7 -9.6 -4.6 1989 -5.0 -8.1 -13.8 -14.6 -18.0 -23.4 -17.3 -18.6 -14.2 -13.4 -10.3 -2.6 1990 -2.7 -8.2 -13.6 -15.8 -17.3 -20.4 -12.7 -19.9 -19.0 - - - 1991 - - -10.6 -12.5 -17.9 -13.4 -19.4 -14.0 -16.8 -13.9 -7.6 -1.5 1992 -2.5 -5.5 -9.8 -13.9 -18.1 -14.5 -17.2 -12.3 -18.3 -16.7 -7.5 -4.7 1993 -1.0 -5.7 - - - - - - - -14.6 -8.2 -3.2 1994 -3.3 -7.4 -12.4 -15.7 -21.6 - - - -14.6 -13.3 -8.2 -3.9 1995 -3.9 -6.5 -9.7 -12.5 -17.4 - - - - - - - 1996 - - - - - - - - - - - - 1997 - - - - - - - - - - - - 1998 - - - - - - - - - - - - 1999 -5.6 -8.3 -14.0 -18.4 -20.7 - - - -19.0 -14.1 -9.0 -5.8 2000 -6.0 -8.3 -12.3 -19.8 -17.2 -18.5 - - - - - -3.9 2001 -2.8 -7.9 -10.8 -16.4 -16.5 -17.8 - - - -13.7 - - 2002 -2.9 - - - -16.5 -14.7 - - -17.0 -15.3 - - 2003 - - - - - - - -18.4 -16.5 -16.1 -10.2 -3.5 2004 -2.1 -5.8 -11.6 - - -14.6 - - - - - - 2005 - - - - - - - - -16.5 -12.4 - - 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - -14.1 -15.9 -16.9 -20.8 -21.1 -17.0 -18.0 -17.1 -8.2 -3.9 2009 -2.9 -6.7 -13.4 -18.1 -17.3 -17.9 -14.1 -17.4 -16.1 -16.1 -8.7 -3.4 2010 -0.7 -7.4 -12.3 -18.4 -18.6 -20.5 -21.8 -19.2 -22.1 -14.6 -8.5 -3.0 2011 -2.4 -8.6 -12.3 -15.1 -19.8 -18.7 -20.8 -19.0 -17.2 -15.1 -8.7 -3.3 2012 -4.0 -7.9 -13.0 -18.2 -17.5 -18.8 -21.4 -17.6 -19.4 -16.1 -8.8 -3.8 2013 -3.1 -8.5 -13.5 -19.2 -18.5 -19.9 -23.2 -18.8 -14.1 -14.6 - - 2014 - -7.6 -13.2 - - - - - - - - - 2015 - - - - - - - - - - - - 2016 - - - - - - - - - - - - 2017 - - - - - - - - - - - - 2018 -3.3 -7.3 -12.7 -11.6 -19.9 -21.3 -17.7 -19.0 -19.4 -16.1 -9.4 -4.5 2019 -4.1 -7.6 -13.2 -19.1 -22.8 -23.3 -18.2 -21.2 -20.9 -16.5 - - 2020 -3.3 -7.5 -14.1 -13.1 -18.2 -20.0 -15.9 -20.4 -18.1 -16.0 -9.7 -3.5 2021 -3.9 -8.7 -13.1 -18.7 -20.4 -18.8 -20.6 -15.2 -17.6 -13.0 -10.1 -5.4 2022 -4.7 -6.6 -10.9 -16.6 -17.2 -18.1 -17.5 -20.3 -16.3 -13.3 -10.3 -5.1 2023 -5.2 -6.6 -10.4 -13.6 -18.6 -17.5 -19.0 - - - - - 2024 - - - - - - - - - - - -