Theresa 18Z temperature 1994 - - - - - - - - - - - -11.1 1995 -12.2 -15.6 -25.2 - -27.7 -27.5 -31.5 -31.8 -28.7 -24.2 - - 1996 - -17.6 -24.0 -20.3 - - - - - -25.5 -14.4 -10.8 1997 -11.6 -20.2 -25.8 -27.4 - - - - -29.5 -21.9 -16.3 -10.6 1998 -11.4 -14.2 -24.8 -30.4 -25.7 -20.7 -30.1 -28.4 -30.9 -25.8 -18.7 -11.7 1999 -10.6 -17.8 -21.7 -30.8 -27.9 -26.3 -26.0 -30.2 -25.8 -20.2 -16.2 -13.4 2000 -13.8 -16.2 -20.9 -26.8 -27.6 - - - - -22.0 -16.3 -13.4 2001 -13.4 -14.1 -23.1 -25.2 -25.7 -26.4 -29.3 -32.7 -25.6 -24.8 -16.0 -11.5 2002 -10.2 -17.5 -23.0 -25.5 -26.3 -32.2 - - - - - - 2003 - - - - -25.9 -28.6 - - - - -19.8 -10.9 2004 -11.9 -17.8 -25.9 - - -27.0 -36.7 -32.5 -28.0 -22.2 -17.7 -11.4 2005 -9.2 -18.1 -24.0 -25.7 -27.3 -29.2 -29.7 -31.5 -23.8 -22.6 -17.2 -10.7 2006 -11.1 -14.3 -23.3 - -30.7 -27.1 -30.8 -25.7 -28.4 -22.6 -16.0 -13.1 2007 -9.0 -17.6 -22.5 -24.6 -23.6 -28.3 - - - - - - 2008 - -18.1 -19.7 -23.6 -27.2 -26.0 -28.4 -33.5 -24.9 -21.8 -18.5 -12.1 2009 -11.8 -19.9 -21.8 -24.4 -26.2 -27.4 - - -27.5 -25.0 -15.3 -10.5 2010 -9.8 -17.3 -22.6 -23.3 -26.6 -28.0 -32.0 -26.5 -28.7 -22.1 -16.7 -10.6 2011 -11.3 -17.3 -23.1 -26.1 -25.6 -26.8 -22.5 -24.4 -31.5 -21.6 -13.9 -10.9 2012 -12.9 -15.4 -21.4 -24.5 -24.8 -29.2 -28.2 -29.6 -28.8 -22.5 -17.5 -9.2 2013 -9.3 -17.6 -17.7 -26.4 -28.3 -28.7 -30.7 -25.6 -26.7 -22.7 -17.1 -10.4 2014 -11.6 -19.4 -24.1 -25.4 -21.4 -26.6 -31.5 -26.2 -22.3 -23.0 -17.4 -12.5 2015 -10.7 -15.0 -23.6 -28.4 -27.4 -29.1 -29.8 -31.5 -29.8 - - - 2016 - -17.2 -23.6 -29.3 -25.9 -27.0 -30.5 -27.5 -28.6 -22.0 -15.2 -8.9 2017 -11.6 -14.6 -19.4 -22.3 -22.8 -28.2 -30.0 -29.4 -30.2 -21.8 -16.2 -11.0 2018 -11.5 -17.9 -19.7 -23.1 -28.0 -27.8 -28.2 -25.9 -30.6 -20.1 -16.5 -8.6 2019 -11.3 -15.5 -22.9 -23.8 -23.5 -27.4 -28.8 -28.3 -26.5 -24.4 -14.9 -9.9 2020 -10.8 -14.0 -24.5 -24.7 -23.8 -25.7 -27.8 -29.4 -29.3 -23.8 -17.1 -10.9 2021 -12.3 -18.0 -21.8 -32.8 -27.8 -25.5 -24.5 -33.3 -27.3 -23.2 -15.9 -11.5 2022 -11.2 -14.7 -20.3 -24.7 -23.4 - - - - - - - 2023 - - - - - - - - - - - - 2024 - - - - - - - - - - - -