Lettau 00Z temperature 1986 - -14.6 -26.8 -31.5 -25.8 -34.5 -39.2 -43.7 -46.3 -29.1 -14.0 - 1987 -5.1 -16.2 -32.5 -37.3 -35.4 -31.3 -33.3 -39.6 -36.8 -24.8 -17.8 - 1988 -6.3 -15.9 -30.9 -31.6 -32.6 -34.8 -35.7 -26.4 -34.4 -21.2 -15.0 -5.9 1989 -5.6 -17.4 -26.1 -27.1 -35.0 -46.4 -36.8 -40.5 -34.4 -24.8 -13.1 -4.8 1990 -6.1 -16.6 -28.0 -31.3 -35.7 -35.0 -40.0 -39.5 -40.2 -27.2 -14.7 -4.4 1991 -6.7 -11.9 -28.9 -29.3 -33.3 -31.1 - - - - -13.3 -4.1 1992 -5.1 -15.9 -20.4 -37.9 -31.0 -35.3 - - - - -14.2 -5.0 1993 -5.7 -14.2 -28.4 -32.5 -40.5 -33.1 - - - - -14.6 -8.3 1994 -7.2 -16.5 -31.5 -26.6 -42.7 -35.5 -34.1 -42.2 -44.8 -23.0 -12.7 -4.6 1995 -6.5 -14.3 -28.1 -36.8 -40.9 -30.4 - - - - -12.8 -4.2 1996 -5.4 - - - - - - - - - - -4.2 1997 - - - - - - - - - -21.1 - - 1998 - - -27.5 -39.9 -34.0 - - - - - - - 1999 - -16.7 -31.1 -40.0 -38.3 -38.8 -31.6 -41.8 -27.6 -24.2 - - 2000 - - -22.6 -30.4 -33.9 -35.9 -32.5 -35.4 -35.1 -27.0 - - 2001 - - -28.4 -30.0 -37.1 -30.9 -30.2 -47.1 -33.3 -25.4 - - 2002 - - -21.1 -33.4 -26.9 -42.1 -43.3 -41.5 -30.2 -23.9 - - 2003 - - -25.9 -32.1 -31.5 -31.8 -33.0 -44.9 -36.7 -22.0 - - 2004 - - -28.6 -32.2 -38.4 -32.9 -48.4 -44.1 -39.4 -28.0 - - 2005 - - -26.2 -37.2 -29.9 -34.6 -30.9 -39.6 -34.1 -23.8 - - 2006 - - -27.1 -40.7 -44.5 -31.2 -41.7 -31.5 -32.0 -26.2 - - 2007 - -14.0 - - - -33.9 -35.7 -37.7 -34.7 -30.3 -15.2 -5.6 2008 -5.5 -17.5 -26.0 -34.0 -34.0 -30.8 -41.0 -48.9 - - - - 2009 - -20.7 -30.2 -27.3 -39.5 -42.5 -38.5 -41.0 -40.8 -28.4 -11.6 -6.2 2010 -8.5 -15.6 -29.5 -34.1 -40.4 -39.9 -41.4 -40.1 - -28.8 -13.9 -7.5 2011 -7.7 -16.4 -26.2 -31.3 -31.6 -31.2 - - - - - - 2012 - - - - - - - - - - - - 2013 - - - - - - - - - - - - 2014 - -14.3 -27.0 -36.7 -30.4 -39.9 -44.7 -28.6 -25.7 -19.9 -18.2 -9.2 2015 -7.3 -12.0 -25.9 -37.2 -33.8 -35.2 -41.8 -40.0 -39.2 -25.2 -15.2 -7.0 2016 -4.2 -16.1 -27.9 -35.0 -34.8 -40.4 -42.4 -37.6 -36.7 -25.6 -15.8 -7.0 2017 -6.9 -16.4 -25.2 -23.0 -26.0 -34.2 -38.5 -31.8 -41.0 -26.2 -17.7 -8.4 2018 -7.6 -16.2 -21.8 -31.0 -35.4 -33.8 -36.9 -44.7 -34.9 -21.5 -11.4 -5.6 2019 -8.1 -12.9 -26.2 -33.5 -30.6 -33.3 -33.1 -32.9 -29.1 -24.2 -13.6 -6.0 2020 -8.6 -11.7 -27.1 -33.2 -31.0 -34.3 -35.2 -37.3 -36.0 -22.9 -16.3 -7.0 2021 -7.3 -15.9 -29.4 -39.5 -34.6 -33.4 -35.0 -50.4 -35.5 -25.4 -13.2 -5.5 2022 -6.9 -12.8 -25.9 -31.1 -27.8 -35.7 -28.6 -35.0 -35.6 -25.9 -19.4 -6.6 2023 -7.9 - -28.2 -35.2 -39.3 -31.5 -45.2 -48.1 -23.8 -27.9 -15.9 -8.0 2024 -6.9 -17.0 -24.3 -28.6 -34.3 -31.0 -36.1 -35.6 -39.7 -24.4 -17.7 -