Hi_Priestley_Gl temperature 1989 - -29.4 -37.1 -37.9 - - - - - -39.2 -28.8 -19.0 1990 -21.4 - - - - - - - - - -27.6 -19.1 1991 -20.7 -26.0 -38.2 -39.2 - -39.7 - - -41.5 -36.0 -29.5 -18.0 1992 -20.1 -27.5 -35.4 -42.6 - -41.2 - -38.9 - -38.8 - - 1993 - - - - - - - - - - -28.7 -22.1 1994 -21.3 -31.1 -41.2 -40.4 - - - - -41.3 -38.1 - - 1995 - - - - - - - - - - - - 1996 -22.0 -28.4 -34.9 -40.7 - - - - - -42.1 -27.4 -20.1 1997 -21.5 -29.6 -37.8 - - - - - - - - -21.2 1998 -22.2 -27.9 -40.7 - - - - - - -39.1 -31.2 -21.4 1999 -21.1 -29.2 -38.5 -43.0 -47.1 -42.4 -43.5 -47.2 -45.1 -38.9 -27.9 -21.9 2000 -22.9 -29.8 -38.0 -46.0 -42.3 -45.8 -45.6 -46.5 -40.0 -37.9 -27.0 -21.2 2001 -21.2 -29.2 -39.5 -44.1 - - - - - - -29.3 -20.6 2002 -18.5 -30.6 -36.6 -46.0 -43.4 -41.8 -48.0 -51.1 -42.6 -37.5 -29.3 -20.7 2003 -19.1 -29.1 -39.5 -44.7 -44.4 -46.6 -46.5 -46.0 -41.6 -41.2 -28.9 -19.7 2004 - - - - - - - - - - - -20.1 2005 -20.1 -29.0 -38.8 -45.8 -46.7 -43.0 -45.6 -44.7 -44.7 -35.2 -28.6 -17.5 2006 -20.9 -29.5 -40.2 -43.7 - - - - - -38.5 -28.0 -22.7 2007 -18.3 -29.6 -36.9 -42.6 -42.6 -46.1 -45.7 -49.3 -46.4 -38.0 -29.1 -21.6 2008 -20.8 -31.6 -37.7 -42.7 - - - - -45.5 -38.1 -28.8 -20.8 2009 -20.7 -29.7 -39.1 -45.0 -43.3 -44.7 -42.0 -42.8 -46.1 -41.4 -27.2 -20.8 2010 -18.9 -27.3 -34.2 -44.9 -46.4 -49.8 -51.1 -46.1 -47.2 -39.4 -29.3 -19.8 2011 -20.5 -26.4 -37.1 -38.6 -43.8 -41.9 -44.3 -42.2 -41.1 -36.5 -27.1 -20.1 2012 -20.5 -28.0 -38.7 -46.8 - - - - - -39.8 -28.1 -18.4 2013 -19.6 -28.9 -38.3 -44.9 -44.1 -45.0 -48.8 - - -37.9 - - 2014 - -28.9 -39.6 -44.1 -42.2 -47.6 -46.0 -46.2 - -36.1 -29.0 -22.0 2015 -20.4 -27.7 -37.0 -44.8 -43.7 -46.1 - - - -37.0 -31.1 -19.9 2016 -19.3 -28.6 -38.2 -45.9 -41.3 -44.7 -45.6 - -43.3 -39.4 -25.7 -19.5 2017 -18.4 -27.6 -36.8 -44.6 -44.7 -46.6 -48.4 - - - - -20.7 2018 -19.9 -28.4 -36.5 -40.5 -47.6 - - -44.6 -44.4 -37.4 -29.1 -19.8 2019 -19.6 -28.6 -35.8 -43.8 -43.1 -46.7 -41.8 -44.5 -47.7 -39.6 -26.7 -18.6 2020 -19.8 -25.5 -34.8 -43.3 -45.8 -47.3 -42.0 - - -41.8 -30.9 -19.8 2021 -21.0 -29.4 -37.1 -44.6 -49.3 -47.2 -44.4 -41.9 -42.7 -38.2 - - 2022 -21.8 -27.6 -35.9 -43.8 -44.2 -41.9 -45.4 - - - -28.2 -21.3 2023 -21.9 -28.3 -36.1 -41.0 -45.4 - - - - - -29.6 -21.0 2024 -20.9 -29.7 -39.3 -45.5 -47.0 - -44.0 -44.0 -42.8 -37.5 -31.4 -19.3 2025 -19.0 -27.1 -38.8 -43.9 -44.2 -41.1 - - - -36.0 -27.7 -18.4 2026 - - - - - - - - - - - -