Priestley_Gl 06Z temperature 1987 - - -21.3 - - - - - -27.0 -19.8 -13.8 -5.8 1988 -6.2 -12.3 - - - - - - - -17.4 - -7.1 1989 - -13.4 -21.4 -24.5 -30.3 -34.5 -29.2 -32.4 -25.7 -22.3 -13.2 -6.0 1990 -6.6 -13.7 -21.6 -29.0 -27.4 -29.9 -23.8 -31.9 -28.4 -21.8 -11.3 -5.4 1991 -6.7 -11.1 -22.1 -24.9 -28.5 -25.4 -30.1 -28.0 -26.2 - - -4.8 1992 -6.7 -12.3 -20.7 -28.6 -28.0 -26.7 -27.9 -23.6 -30.8 -22.9 - -7.7 1993 -5.6 -13.1 -20.9 -28.0 -31.8 -30.5 -29.6 -30.4 -26.0 -21.9 -12.9 -7.3 1994 -6.0 -13.9 -24.6 -24.9 -31.4 -30.0 -26.8 - - - - -7.8 1995 -7.5 -11.7 -20.0 -24.6 -28.7 -29.6 -28.9 -27.8 -27.7 -22.4 -13.3 - 1996 -7.2 -11.6 -18.2 -24.2 -30.9 -30.7 -30.1 -26.0 -28.9 -24.2 - -6.1 1997 -6.5 -13.1 -21.0 -29.5 -31.9 - - - - - - -8.2 1998 -8.4 -12.4 -24.4 -28.8 -29.5 -29.1 -32.0 -30.0 -28.7 -22.5 -13.7 -6.5 1999 -6.0 -12.2 -22.0 -28.4 -31.2 - - - - - -11.7 -7.5 2000 -7.7 -13.5 -22.0 -29.0 -27.7 -29.5 -28.8 -30.6 -23.6 - - -7.4 2001 -7.1 -11.5 -21.3 -27.1 -29.7 -28.6 -30.7 -30.2 -28.1 -22.3 -13.2 -5.8 2002 -4.2 -12.6 -19.6 -28.6 -26.6 -25.4 -30.8 -34.5 -25.9 -20.8 -13.4 -7.3 2003 -4.9 -12.2 -23.1 -28.5 -27.7 -30.1 - - - - -13.4 -5.7 2004 -6.1 -12.0 -20.8 -27.7 -31.1 -24.5 - -28.5 -27.0 -21.8 -12.1 -4.2 2005 -5.5 -12.5 -20.3 -28.7 -29.1 -27.8 - - - - -11.6 -4.2 2006 -5.5 -11.4 -21.5 -27.3 -29.4 -29.0 -31.8 -29.3 -28.4 - - -8.6 2007 -5.9 -14.3 -21.8 -28.3 -27.9 -31.0 -31.5 -34.2 -31.1 -22.2 -14.3 -7.7 2008 - - - - - - - - - - -13.1 -6.6 2009 -6.7 -14.3 -23.6 -30.4 -29.4 -31.8 -28.4 - - - - -7.1 2010 -5.9 -12.8 -19.9 -30.8 -32.5 -35.1 -36.8 -32.1 -32.8 -23.6 - - 2011 - - - - - - - - - - - -6.1 2012 -7.0 - - - - - - - - - - -6.5 2013 -7.0 -15.7 -23.4 -31.5 -30.9 -31.8 - - -28.1 -23.0 -15.2 -6.1 2014 -5.1 - - - - - - - - - - -8.1 2015 -7.7 -13.4 -22.2 -30.7 -30.9 -33.0 - - -33.2 -22.9 -15.9 -7.0 2016 -7.6 -14.5 -23.9 -32.2 -28.5 -33.0 - - - -24.3 -11.6 -7.3 2017 -7.7 -13.0 -22.6 -30.9 -31.5 -33.2 - - -30.1 -21.7 -13.9 -8.5 2018 -7.8 -14.1 -22.2 -26.8 -33.7 -32.8 - - - -22.3 -13.7 -8.1 2019 -8.4 -14.3 -21.7 -30.2 -30.4 -33.7 - - -32.8 -24.8 -12.0 -7.4 2020 -6.6 -11.7 -22.7 -29.7 -32.2 -33.5 - - - -26.6 -15.7 -7.0 2021 -7.1 -14.4 -22.8 -31.3 -35.7 - - - - -22.9 -14.3 -7.5 2022 -8.2 -12.9 -21.5 -30.1 -30.9 -28.8 - - -31.0 - - - 2023 -8.2 -13.6 -22.5 -27.9 -32.0 -31.3 -30.7 -34.4 -28.8 -26.6 -15.2 -8.3 2024 -8.5 -15.1 -25.0 -31.5 -33.2 -33.5 -29.7 -30.7 -29.1 -23.5 -15.9 -6.9 2025 -6.6 -13.6 -23.3 -30.1 -30.7 -28.2 -29.8 -31.8 -28.6 -21.5 - - 2026 - - - - - - - - - - - -