D_47 18Z temperature 1983 - -17.7 - - -28.7 -27.2 - - - - -24.8 - 1984 - -20.8 -22.4 -31.0 -27.1 -33.6 -33.7 -28.2 -30.3 -30.2 -26.5 -16.8 1985 -16.3 -20.9 -25.6 -30.3 -31.6 - - - - - - -19.5 1986 -17.4 -16.3 -21.7 -28.7 -31.7 - - - - - - -18.6 1987 - - - - -32.1 -25.2 - -33.1 -28.8 -25.8 -23.4 - 1988 -15.9 - - -27.1 - - - - - - - - 1989 - - - - - - - - - - - - 1990 - - - - - - - - - - - - 1991 - - - - - - - - - - - - 1992 - -20.2 -25.3 -27.8 -30.9 -27.2 - - - -32.4 -21.6 -19.2 1993 -14.2 -19.4 -23.0 -27.9 -30.9 -34.1 - - - - - - 1994 - - - - - - - -34.6 -26.0 - - - 1995 - - - - - - - - - - - - 1996 - - - - - - - - - - - - 1997 - - - - - - - - - - - - 1998 - - - - - - - - - - - - 1999 - - - - - - - - - - - - 2000 - - - - - - - - - - - - 2001 - - - - - - - - - - - - 2002 - - - - - - - - - - - - 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - -21.8 -27.5 - - - - -31.2 - - - -15.2 2006 - -20.4 - - - - - - - - - - 2007 - -22.1 -22.5 - - - - - - - - - 2008 -17.4 - - - - - - - - - - -17.2 2009 - - -26.5 -30.3 -29.4 -28.9 -25.4 -29.2 -28.7 -31.0 -24.2 -17.8 2010 - -21.1 -25.1 -30.8 -29.3 -32.0 -33.5 -29.5 -33.8 -27.3 -22.5 -15.9 2011 -15.0 -23.2 -25.9 -26.8 -31.6 -30.4 -32.6 -29.5 -28.0 -28.1 -22.7 -16.2 2012 -17.8 -21.4 -25.4 -29.6 -27.9 -29.3 -31.8 -28.4 -31.1 -29.3 -22.7 -15.9 2013 -14.9 -22.4 -26.4 -31.0 -29.6 -30.8 -34.2 -29.0 -25.3 -28.2 -24.3 -14.2 2014 -14.8 -21.2 -25.8 -27.1 -31.2 -33.4 -28.7 -33.5 -31.9 -29.7 -22.2 -16.9 2015 - - -23.3 -29.9 -28.4 -31.4 -32.6 -31.2 -33.6 -33.1 -24.4 -16.8 2016 -18.4 -22.3 -25.0 -30.4 -24.5 -30.4 -29.5 -30.1 -30.7 -27.5 -19.7 -17.4 2017 -15.2 -16.5 -26.7 -29.6 -29.5 -33.7 -31.3 -33.5 -28.8 -28.7 -23.2 -17.7 2018 -16.4 -20.1 -26.3 -23.4 -31.6 -32.7 -28.5 -29.6 -31.9 -29.7 -23.6 -17.1 2019 -17.8 -20.0 -22.3 -27.4 -30.5 -32.3 -25.9 -31.3 -32.1 -28.5 -20.4 -15.4 2020 -14.7 -20.9 -27.4 -24.3 -30.1 -31.7 -27.2 -32.9 -30.9 -29.4 -23.6 -16.2 2021 -16.7 -22.3 -26.3 -31.3 -32.8 -30.2 -31.7 -26.0 -30.3 -24.7 -23.9 -17.6 2022 -19.4 -20.1 -23.7 -29.7 -29.1 -30.2 -28.8 -31.9 -28.8 -26.9 -21.6 -18.0 2023 -18.1 -18.8 -22.2 -25.5 -30.7 -29.1 -31.2 -31.4 -29.9 -31.1 -23.7 -18.0 2024 -18.4 -22.0 -25.6 -34.1 -31.4 -31.9 -27.1 -30.1 -30.8 - -22.7 -