Gill 12Z temperature 1985 - -18.8 -27.6 -38.6 - -38.5 -50.7 -42.8 -41.5 -31.0 -18.6 -11.2 1986 -9.7 -17.9 -28.5 -35.5 -26.4 -34.8 -40.6 -47.8 -48.7 -34.6 -18.8 -10.6 1987 -8.3 -18.1 -36.5 -38.0 -38.1 -31.5 -34.8 -40.4 -39.5 -29.6 -23.2 -8.5 1988 -8.8 -19.8 -33.0 -34.6 -34.0 -35.5 -36.7 -30.7 -37.1 -28.6 -19.2 -8.5 1989 -9.0 -20.1 -28.4 -27.3 -39.7 -47.6 - - - - - - 1990 - - - - - - - - - - - - 1991 - -15.6 -32.6 -33.4 -35.7 -33.8 -41.3 -42.2 -34.5 -28.7 -18.6 -7.4 1992 -8.0 -19.4 -20.7 -37.8 -34.5 -36.5 -33.9 -44.7 - - -19.2 -9.3 1993 -9.3 -19.0 -30.4 -35.2 -40.5 -31.6 -35.1 -42.7 - - -20.0 -11.9 1994 -12.0 -23.0 -33.3 -30.1 -42.4 -39.8 -35.1 - - - - -7.9 1995 -10.1 -17.8 -29.0 -39.2 -39.4 -34.5 -41.2 - - - - -9.2 1996 -9.7 -20.7 -34.7 -28.9 -38.8 -37.2 -41.2 -34.3 -38.2 -37.0 -17.7 -9.7 1997 -10.0 -18.8 -31.9 -41.6 -35.2 -32.9 -40.1 -45.0 -38.0 -25.2 -14.4 -9.1 1998 -9.9 -15.8 -29.9 -41.8 -33.7 -31.2 -43.9 -39.9 -43.5 -31.9 -21.5 -10.8 1999 -10.5 -21.1 -35.5 -40.9 -43.1 -39.8 -31.4 -43.7 -30.9 -29.5 -17.9 -11.0 2000 -12.2 -19.6 -24.9 -33.4 -36.8 -39.5 -36.0 -38.2 -38.8 -32.1 -15.6 -11.2 2001 -13.6 -18.7 -32.5 -33.2 -38.5 -37.0 -35.0 -49.5 -39.4 -32.0 -20.7 -10.5 2002 -10.2 -19.3 -23.6 -36.3 -31.2 -40.4 -46.4 -44.2 -31.2 -28.9 -18.6 -11.0 2003 -8.2 - -28.8 -35.0 -33.8 -33.3 -35.4 -44.9 -40.3 -29.8 -20.4 -9.2 2004 -11.4 -23.0 -32.9 -32.7 -41.5 -35.5 -48.2 -47.2 -44.1 -35.4 -18.7 -9.1 2005 -7.8 -20.5 -30.3 -38.0 -32.8 -36.8 -34.7 -41.2 -38.7 -29.5 -17.7 -7.6 2006 -9.9 -15.6 -29.3 -38.0 -45.2 -35.3 -44.5 -35.0 -33.9 -31.8 -18.5 -10.0 2007 -8.1 -16.5 -27.9 -33.1 -36.0 -36.8 -35.9 -37.8 -36.0 -33.8 -17.9 -8.5 2008 -7.3 -19.9 -29.6 -33.4 -36.5 -32.2 -41.9 -50.8 -36.8 -30.8 -22.0 -10.4 2009 -9.6 -22.7 -32.0 -24.5 -40.4 -40.2 -37.1 -41.6 -41.9 -32.2 -15.0 -8.8 2010 -10.0 -17.9 -28.9 -31.8 -40.9 -43.6 -42.9 -42.6 -42.9 -33.2 -19.3 -9.8 2011 -10.0 -20.0 -26.5 -33.6 -35.3 -34.6 -30.8 -35.6 -38.1 -28.8 -18.1 -8.3 2012 -9.2 -15.2 -26.5 -32.3 -29.4 -41.6 -42.9 -42.4 -36.1 -27.5 -19.6 -7.3 2013 -7.5 -16.0 -23.7 -41.3 -32.6 -43.5 -41.7 -41.5 -37.7 -28.9 -20.4 -9.5 2014 -8.8 -18.4 -28.7 -40.2 -35.3 -42.8 -48.1 -30.3 -30.3 -26.2 -20.8 -11.3 2015 -9.6 -15.4 -28.9 -39.9 -34.7 -39.6 -44.8 -39.4 -41.3 -32.4 -21.2 -9.7 2016 -6.2 -19.2 -30.4 -37.2 -35.8 -42.3 -43.5 -39.8 -39.7 -30.4 -19.0 -10.1 2017 -9.6 -20.0 -27.9 -26.9 -30.3 -37.6 -42.2 -35.6 -45.0 -29.7 -21.7 -10.6 2018 -10.5 -17.6 -26.4 -32.5 -39.2 -38.1 -40.9 -46.0 -36.3 -25.1 -17.1 -8.7 2019 -9.8 -14.7 -26.4 -35.7 -32.3 -35.7 -34.6 -32.6 -32.0 -29.5 -19.3 -8.0 2020 -9.5 -14.0 -27.9 -34.5 -33.9 -37.5 -34.8 -36.9 -37.9 -27.3 -21.2 -11.2 2021 -9.2 -20.2 -32.5 -39.3 -34.8 -37.2 -36.2 -49.2 -40.6 -33.4 -20.0 -10.0 2022 -11.2 -15.6 -27.2 -31.9 -32.2 -39.7 -31.9 -38.8 -38.7 -34.4 -23.1 -9.4 2023 -9.5 -17.6 -31.8 -36.6 -42.7 -34.3 -44.8 -47.8 -26.0 -33.1 -21.7 -10.6 2024 -8.8 -19.5 -26.9 -31.2 -35.2 -31.6 -39.7 -37.9 -43.6 - -20.4 -