Hi_Priestley_Gl 18Z temperature 1989 - -31.5 -39.3 -38.0 - - - - -42.3 -41.6 -31.6 -21.4 1990 -24.9 - - - - - - - - - -31.5 -22.1 1991 -24.2 -28.8 -39.5 -38.7 - -39.6 - -42.5 - -38.1 -32.9 -20.3 1992 -22.9 -30.7 -37.1 -42.5 -41.6 -41.1 - -38.8 - -40.4 - - 1993 - -32.0 - - - - - - - - -31.9 -25.5 1994 -24.7 -34.7 - -40.7 - - - - - -41.2 - - 1995 - - - - - - - - - - - - 1996 -24.8 -31.6 -36.4 -40.3 - - - -40.3 - - -30.5 -23.0 1997 -24.4 -33.3 -39.6 - - -43.2 - - - - - -23.7 1998 -25.3 -31.5 -42.6 - - - - - - -41.7 -35.3 -24.8 1999 -24.4 -32.5 -40.3 -43.2 -47.1 -42.2 -43.4 -47.2 -46.2 -42.1 -31.0 -25.0 2000 -26.2 -33.2 -40.0 -45.8 -42.7 -45.9 -45.9 -46.0 -40.7 -40.3 -29.8 -24.2 2001 -24.3 -32.5 -41.9 -44.7 - - - - - - -33.0 -24.2 2002 -21.3 -33.9 -38.2 -46.3 -43.7 -42.3 -47.9 -51.4 -43.2 -39.9 -32.4 -22.6 2003 -21.3 -32.5 -41.3 -45.3 -43.9 -47.1 -46.5 -46.2 -42.3 -43.5 -31.1 -22.7 2004 - - - - - - - - - - - -24.0 2005 -23.2 -32.5 -41.1 -46.5 -46.8 -42.9 -45.4 -45.3 -45.3 -38.1 -32.2 -19.9 2006 -24.5 -33.1 -42.3 -43.7 - - - - - -40.8 -31.0 -26.1 2007 -20.7 -32.9 -38.5 -42.9 -42.1 -46.8 -45.8 -49.2 -47.8 -40.5 -32.0 -24.9 2008 -23.6 -34.7 -39.4 -42.7 - - - - -46.4 -40.0 -32.2 -24.5 2009 -24.4 -33.2 -41.0 -45.6 -43.2 -44.6 -42.4 -42.9 -47.0 -43.6 -29.7 -24.2 2010 -22.1 -30.4 -36.1 -45.2 -46.2 -49.6 -50.8 -46.2 -48.1 -41.7 -33.1 -22.8 2011 -24.0 -28.9 -39.1 -39.4 -43.8 -42.2 -43.9 -42.1 -42.5 -38.9 -30.4 -23.2 2012 -23.5 -31.4 -40.7 -47.4 - - - - - -42.2 -31.0 -21.0 2013 -22.8 -31.9 -40.3 -45.1 -44.5 -44.8 -49.3 - - -40.6 - - 2014 - -32.1 -41.3 -44.7 -41.9 -47.4 -45.4 -46.4 - - -32.5 -25.9 2015 -23.8 -31.1 -38.5 -45.6 -44.0 -46.0 - - - -39.0 -34.6 -23.2 2016 -22.4 -32.2 -40.3 -46.6 -41.7 -44.4 -45.4 - -43.9 -42.3 -28.8 -22.7 2017 -20.6 -31.0 -38.5 -44.8 -44.9 -46.9 -48.5 - - - - -23.7 2018 -23.5 -31.7 -38.8 -41.0 -47.7 - - -44.8 -44.8 -39.3 -32.6 -22.4 2019 -22.4 -32.0 -37.7 -43.9 -42.9 -47.0 -41.9 -45.0 -48.9 -42.1 -30.1 -21.2 2020 -23.2 -28.5 -35.9 -44.0 -45.5 -47.1 -41.9 - - - -33.7 -23.4 2021 -24.2 -33.0 -39.0 -44.9 -49.7 -47.3 -44.3 -42.3 -43.5 -40.5 - - 2022 -25.4 -30.8 -37.3 -44.4 -43.9 -42.4 -44.9 - - - -30.8 -24.9 2023 -26.1 -31.7 -37.7 -41.2 -45.5 - - - - - -32.4 -24.4 2024 -23.9 -32.4 -40.9 -45.9 -47.0 - -43.5 -44.2 -44.0 -39.6 -35.8 -22.7 2025 -22.0 -30.1 -40.8 -44.1 -44.3 -41.1 - - - -38.4 -30.4 -21.8 2026 - - - - - - - - - - - -