Gill 18Z temperature 1985 - -18.5 -28.0 -38.7 -35.6 -38.7 -51.4 -43.5 -41.6 -30.2 -18.6 -9.3 1986 -10.1 -18.3 -29.0 -34.3 -26.8 -35.1 -41.6 -47.9 -48.8 -33.0 -17.7 -9.3 1987 -8.3 -17.8 -37.0 -39.2 -38.3 -31.2 -33.7 -40.4 -38.8 -28.8 -21.8 -7.7 1988 -8.3 -19.6 -33.0 -33.8 -33.3 -35.5 -37.3 -31.4 -37.4 -28.1 -18.5 -7.8 1989 -8.6 -22.2 -28.6 -28.2 -39.0 -47.7 - - - - - - 1990 - - - - - - - - - - - - 1991 - -14.8 -32.6 -32.8 -34.5 -34.4 -41.3 -41.9 -34.4 -27.7 -17.3 -6.4 1992 -7.0 -18.5 -21.2 -37.8 -33.2 -36.3 -34.7 -44.4 - - -18.0 -8.1 1993 -8.3 -17.5 -31.8 -34.9 -41.0 -31.8 -33.9 -41.9 - - -18.0 -10.5 1994 -11.2 -21.7 -34.6 -29.7 -42.8 -40.0 -35.9 - - - - -7.1 1995 -9.3 -17.7 -29.2 -39.0 -40.6 -32.5 -41.5 - - - - -8.1 1996 -8.7 -20.4 -35.3 -29.1 -37.9 -36.7 -41.5 -33.6 -39.0 -35.7 -16.7 -9.1 1997 -9.4 -18.9 -31.7 -42.4 -36.0 -34.1 -40.1 -45.7 -38.9 -24.4 -13.5 -8.5 1998 -10.3 -15.6 -29.8 -41.3 -34.2 -30.3 -45.1 -39.8 -43.4 -29.9 -19.8 -9.9 1999 -10.2 -20.3 -35.8 -40.3 -42.6 -39.1 -31.8 -43.9 -32.3 -28.7 -16.9 -10.4 2000 -11.5 -19.0 -24.8 -32.7 -36.6 -38.8 -36.3 -38.8 -38.3 -31.3 -15.2 -10.2 2001 -13.1 -18.5 -33.5 -33.0 -38.6 -37.2 -36.1 -49.7 -39.7 -30.6 -19.3 -9.3 2002 -9.7 -18.8 -25.1 -35.9 -32.1 -42.1 -46.3 -43.6 -32.0 -25.2 -16.4 -9.7 2003 -7.5 - -28.4 -35.5 -33.3 -33.8 -35.6 -44.4 -40.7 -27.4 -19.0 -8.4 2004 -10.8 -22.8 -32.1 -32.5 -41.5 -35.6 -47.7 -48.1 -43.6 -32.3 -16.2 -8.8 2005 -7.3 -19.5 -30.7 -37.8 -33.2 -36.8 -35.3 -41.1 -38.3 -28.3 -16.5 -7.0 2006 -9.5 -14.9 -28.9 -37.6 -45.6 -35.3 -43.9 -35.9 -34.3 -30.3 -17.4 -8.6 2007 -7.5 -16.2 -29.3 -32.9 -36.6 -36.8 -36.2 -38.6 -35.8 -32.9 -16.6 -7.8 2008 -6.8 -19.1 -29.9 -33.4 -36.3 -33.2 -41.5 -51.1 -37.1 -28.0 -19.7 -9.8 2009 -8.9 -20.9 -32.3 -25.6 -40.2 -39.6 -38.3 -40.9 -42.5 -30.5 -14.0 -8.0 2010 -8.9 -17.0 -28.6 -31.8 -40.8 -43.2 -43.0 -42.9 -42.6 -31.5 -17.9 -9.3 2011 -9.5 -20.5 -27.0 -33.8 -34.4 -34.7 -29.5 -34.7 -39.1 -27.1 -18.2 -7.8 2012 -9.3 -15.0 -27.9 -33.0 -28.8 -40.8 -42.9 -42.8 -35.2 -27.0 -19.5 -7.0 2013 -7.1 -16.5 -23.8 -41.7 -32.7 -43.4 -42.0 -41.1 -38.3 -28.4 -20.4 -9.4 2014 -8.5 -17.8 -28.8 -41.8 -35.3 -43.2 -47.2 -30.4 -29.7 -25.9 -20.9 -11.2 2015 -9.6 -16.0 -28.9 -39.6 -35.5 -38.8 -45.8 -39.2 -43.2 -31.6 -21.2 -10.0 2016 -6.3 -19.5 -29.9 -36.3 -37.0 -42.1 -42.8 -39.2 -40.0 -30.7 -18.7 -9.9 2017 -10.2 -20.3 -28.6 -26.1 -30.3 -37.7 -42.6 -35.2 -45.1 -30.3 -21.3 -10.3 2018 -10.2 -18.0 -27.1 -31.6 -38.6 -38.2 -39.8 -45.5 -35.7 -25.7 -17.0 -8.8 2019 -9.8 -15.0 -26.7 -36.3 -32.5 -36.4 -35.1 -33.0 -33.1 -29.5 -18.8 -8.0 2020 -9.7 -13.9 -27.7 -33.7 -33.7 -37.9 -35.5 -37.9 -38.2 -26.6 -21.5 -10.9 2021 -9.1 -19.9 -32.2 -40.9 -35.3 -37.4 -36.2 -48.8 -40.4 -33.1 -19.7 -10.0 2022 -10.8 -15.3 -26.6 -32.5 -31.6 -40.0 -30.8 -38.4 -38.2 -34.4 -22.1 -8.2 2023 -9.5 -17.5 -31.6 -36.9 -42.9 -33.7 -44.5 -47.8 -26.3 -31.8 -21.3 -10.2 2024 -9.4 -20.9 -27.6 -31.8 -34.7 -31.8 -38.4 -37.8 -41.7 -31.8 -19.7 -