Gill 00Z temperature 1985 - -15.8 -26.1 -39.4 - -37.8 -50.7 -42.2 -41.0 -28.2 -16.3 -7.9 1986 -7.2 -15.2 -25.7 -35.1 -27.2 -35.0 -41.5 -47.6 -45.3 -31.0 -14.8 - 1987 -5.8 -14.9 -33.7 -38.2 -39.0 -30.9 -33.8 -40.0 -37.8 -25.2 -18.8 - 1988 -6.5 -15.6 -30.5 -32.8 -32.9 -35.4 -38.1 -30.6 -35.3 -25.5 -15.3 -6.0 1989 -6.2 - -27.0 -27.9 -38.1 -47.5 - - - - - - 1990 - - - - - - - - - - - - 1991 - -12.0 -29.6 -33.1 -35.3 -32.1 - -41.4 -34.2 -24.1 -13.4 -4.6 1992 -5.0 -14.9 -19.3 -37.7 -32.9 -36.3 -34.9 -43.8 - - -15.0 -6.3 1993 -5.7 -14.5 -29.0 -33.5 -40.5 -32.0 -35.2 -42.5 -39.1 -28.8 -15.6 -7.8 1994 -7.8 -16.7 -31.9 -28.5 -42.0 -40.1 -35.0 - - - -13.5 -4.8 1995 -7.1 -14.3 -27.4 -37.7 -41.0 -34.2 -41.8 - - - - -6.2 1996 -6.1 -15.9 -32.3 -28.1 -38.5 -36.9 -41.7 -33.8 -37.5 -32.0 -14.5 -6.1 1997 -7.3 -15.6 -29.4 -40.5 -35.7 -33.0 -40.9 -45.1 -37.6 -20.9 -11.3 -6.3 1998 -7.9 -12.7 -27.7 -41.8 -34.8 -30.1 -45.0 -39.3 -41.5 -26.7 -17.0 -7.3 1999 -7.5 -16.9 -32.2 -39.8 -42.7 -40.4 -31.7 -43.5 -31.8 -25.9 -13.1 -7.9 2000 -9.1 -16.2 -22.9 -32.7 -35.0 -39.9 -36.9 -38.8 -37.3 -29.2 -12.1 -8.0 2001 -9.9 -15.5 -30.3 -32.5 -39.1 -36.9 -34.8 -48.6 -38.2 -27.0 -16.2 -6.6 2002 -7.1 -15.1 -22.8 -36.2 -31.5 -40.5 -46.6 -43.9 -30.2 -21.5 -13.7 -7.8 2003 -4.3 -15.4 -25.6 -33.9 -33.0 -34.0 -34.8 -44.4 -40.0 -25.3 -16.0 -5.9 2004 -7.7 -18.2 -29.8 -32.7 -41.2 -35.5 -48.8 -47.0 -41.2 -29.3 -13.3 -6.5 2005 -5.3 -15.9 -28.0 -36.8 -33.8 -37.3 -33.7 -40.3 -36.6 -24.7 -14.1 -3.7 2006 -6.9 -12.3 -26.9 -37.8 -46.0 -34.9 -43.7 -35.5 -32.4 -27.3 -13.8 -6.9 2007 -4.3 -13.4 -26.1 -33.5 -36.5 -35.7 -36.0 -38.0 -33.2 -29.1 -14.1 -5.6 2008 -4.5 -16.7 -26.0 -31.8 -36.6 -32.9 -42.6 -49.8 -34.6 -25.3 -17.4 -6.9 2009 -6.7 -17.9 -29.1 -25.5 -40.9 -41.4 -38.1 -40.7 -39.8 -26.8 -10.9 -5.3 2010 -5.9 -12.8 -25.3 -32.0 -40.9 -43.6 -43.0 -42.0 -41.1 -28.1 -14.8 -6.3 2011 -6.4 -17.1 -25.9 -34.5 -34.5 -33.5 -29.6 -34.3 -37.9 -25.9 -14.9 -6.1 2012 -7.7 -12.3 -25.6 -31.8 -29.0 -41.0 -42.8 -43.1 -32.6 -24.7 -16.1 -5.2 2013 -5.7 -13.9 -21.8 -41.1 -32.5 -44.5 -42.0 -41.1 -34.1 -24.7 -17.2 -7.7 2014 -6.5 -14.8 -27.5 -40.7 -36.0 -43.1 -47.6 -31.2 -28.9 -21.4 -17.4 -9.2 2015 -7.6 -12.9 -26.6 -40.1 -35.8 -38.7 -45.5 -39.2 -42.2 -28.3 -17.8 -7.9 2016 -4.7 -17.0 -27.2 -35.3 -37.0 -42.1 -42.6 -39.4 -38.1 -26.8 -16.0 -7.9 2017 -7.2 -16.9 -25.8 -26.5 -30.8 -37.2 -43.2 -35.6 -43.3 -28.3 -17.9 -8.6 2018 -8.2 -14.9 -25.2 -31.6 -36.9 -38.3 -39.4 -45.1 -35.0 -23.7 -13.4 -7.0 2019 -8.1 -12.4 -24.1 -35.6 -34.3 -35.3 -34.6 -32.8 -32.9 -26.5 -15.8 -6.3 2020 -7.3 -12.0 -25.7 -33.7 -35.0 -37.1 -35.3 -38.4 -35.8 -24.4 -17.9 -8.1 2021 -7.5 -16.7 -29.9 -40.0 -35.4 -37.3 -36.9 -48.8 -36.8 -30.2 -16.6 -7.8 2022 - -13.0 -25.1 -31.9 -32.2 -38.7 -30.9 -38.1 -36.7 -30.2 -19.0 -6.7 2023 -8.0 -15.6 -29.5 -37.8 -41.2 -35.0 -44.0 -48.5 -26.0 -29.5 -18.3 -8.1 2024 -7.8 -17.6 -26.4 -30.6 -36.6 -31.2 -38.2 -38.4 -41.4 -28.3 -17.2 -