Priestley_Gl 00Z temperature 1987 - - -21.6 - - - - - - -21.6 -16.5 -7.6 1988 -7.7 -14.1 - - - - - - - - - -8.8 1989 -8.0 -15.3 -22.9 -24.8 -30.0 -35.0 -29.4 -32.7 -26.3 -24.3 -15.5 -6.5 1990 -7.7 -15.2 -22.9 -29.1 -27.5 -30.2 -23.9 -31.9 -29.6 -23.4 -13.4 -6.3 1991 -7.9 -12.6 -23.3 -25.4 -28.6 -25.7 -29.7 -28.0 -27.9 - - -5.7 1992 -8.0 -13.9 -21.4 -28.9 -27.7 -26.7 -27.6 -23.6 -31.8 -24.4 - - 1993 - -14.9 -21.7 -28.1 -31.4 -30.5 -29.6 -30.8 -27.1 -23.5 - - 1994 -7.2 -15.9 -26.2 -25.4 -31.8 -30.7 -27.3 - - - - - 1995 - - -21.5 -25.4 -28.5 -29.8 -29.4 - -28.5 -24.1 -15.7 - 1996 -8.5 -13.3 -19.5 -25.0 -30.4 -31.2 -30.0 -26.1 -29.6 -25.9 - -6.8 1997 -8.1 -15.0 -22.5 -29.8 -32.1 - - - - - - -9.1 1998 -11.4 -15.2 -26.1 -28.9 -29.4 -29.2 -32.0 -30.7 -30.0 -23.7 - -8.2 1999 -7.7 -14.5 -23.7 -28.7 -31.4 - - - - - -13.8 -9.0 2000 -9.3 -15.5 -23.9 -29.4 -27.7 -29.6 -29.7 -30.2 -24.2 - - -7.8 2001 -8.0 -14.0 -23.6 -27.4 -29.3 -28.6 -30.2 -30.8 -29.9 -25.1 -14.9 -7.3 2002 -5.3 -15.2 -21.4 -29.2 -27.2 -25.5 -30.7 -34.8 -27.4 -22.9 -14.6 -8.4 2003 -5.9 -14.1 -24.2 -28.4 -27.1 -29.7 - - - - -14.5 -6.7 2004 -6.9 -13.1 -21.9 -27.7 -30.8 -24.8 -33.8 -28.5 -28.1 -23.7 -14.3 -5.4 2005 -6.7 -14.2 -22.0 -29.2 -29.0 -27.7 - - - - -13.7 -4.9 2006 -6.2 -13.4 -23.0 -27.5 -29.6 -28.9 -31.7 -28.9 -29.1 - - -9.9 2007 -7.2 -16.5 -23.5 -28.9 -28.0 -30.6 -31.5 -34.8 -32.4 -24.4 -16.3 -9.7 2008 - - - - - - - - - - - -8.6 2009 -8.5 -16.6 -25.5 -31.6 -29.2 -30.8 -28.3 - - - - -8.5 2010 -7.4 -14.8 -20.8 -30.6 -32.6 -35.3 -36.6 -32.7 -33.5 -25.2 - - 2011 - - - - - - - - - - - -7.8 2012 -8.3 - - - - - - - - - - -7.1 2013 -8.6 -17.6 -24.4 -32.3 -31.2 -32.1 - - - -24.4 -17.3 -7.4 2014 -6.2 - - - - - - - - - - -9.7 2015 -8.8 -15.4 -24.2 -31.4 -31.1 -33.0 - - - -23.8 -17.9 -8.5 2016 -9.0 -16.6 -25.5 -32.7 -28.7 -33.2 - - - -26.3 -13.2 -8.6 2017 -8.1 -15.1 -23.9 -31.4 -31.2 -33.4 - - - -23.1 -15.7 -9.4 2018 -8.7 -15.7 - -26.8 -33.5 -33.0 - - - -24.0 -16.3 -9.5 2019 -9.7 -16.3 -23.3 -30.8 -30.7 -33.2 - - - -26.2 -13.9 -8.4 2020 -8.1 -13.2 -23.8 -30.1 - -33.6 - - - -28.2 -18.0 -8.3 2021 -8.9 -16.6 -24.2 -31.5 -35.9 - - - - -24.8 -16.6 -8.9 2022 -10.0 -15.0 -22.5 -29.9 -31.2 -28.7 - - - -23.8 - - 2023 -9.8 -16.0 -23.9 -27.6 -32.2 -30.9 -30.9 -34.0 -29.4 -28.3 -17.0 -9.4 2024 -9.7 -17.1 -26.1 -31.7 -33.3 -33.6 -29.8 -30.4 -30.1 -25.2 -18.6 -8.4 2025 -7.7 -14.8 -25.2 -30.4 -31.0 -27.9 -30.1 -31.6 -29.2 -23.1 - - 2026 - - - - - - - - - - - -