Harry 18Z temperature 1994 - - - - - - - - - - - -8.0 1995 -10.3 -13.6 -26.4 -28.0 -31.1 -24.1 -32.4 -31.1 -28.3 -24.5 -16.8 -9.4 1996 -9.7 -16.5 -25.5 -19.7 - -26.9 - - - - -14.1 - 1997 - - - - - - - - - - - - 1998 - - - - - - - - - - - - 1999 - -19.1 -23.5 -31.8 -29.9 -30.4 -28.1 -32.9 -25.5 -20.7 -14.7 -11.6 2000 -13.8 -16.4 -20.9 -29.0 -28.8 -27.0 -27.0 -30.2 -30.2 -22.5 -14.8 -13.1 2001 -13.3 -14.7 -24.5 -25.3 -27.2 -25.5 -29.4 -38.3 -29.9 -26.7 -17.4 -11.9 2002 -10.6 -17.1 -21.9 -27.9 -25.4 -32.1 -33.5 -32.7 -21.6 -23.0 -14.3 -11.7 2003 -9.8 -17.1 -23.9 -25.5 -27.9 -29.7 -29.9 -33.7 -31.8 -22.7 -18.9 -11.2 2004 -12.4 -19.1 -28.4 -26.5 -32.1 -28.1 -39.5 -37.7 -33.8 -25.5 -16.8 -10.7 2005 -7.6 -18.9 -25.9 -30.0 -26.9 -28.1 -28.6 -33.8 -23.6 -22.7 -15.2 -10.1 2006 -9.6 -14.5 -24.9 -31.3 -33.9 -26.0 -32.5 -25.9 -29.1 -24.1 -15.1 -12.1 2007 -8.4 -17.9 -22.0 -23.8 -24.6 - - - - -28.7 -16.6 -10.9 2008 -10.1 -18.8 -20.0 -25.7 -28.2 -27.8 -31.4 -39.3 -24.9 -22.1 -19.0 -12.5 2009 -11.7 -19.5 -23.0 -25.7 -29.2 -30.9 -26.6 -32.6 -32.4 -26.4 -13.9 -10.4 2010 -11.2 -15.6 -22.7 -25.9 -30.6 -30.6 -34.8 -29.1 -29.7 -24.3 -17.5 -11.1 2011 -11.5 -18.2 -22.9 -27.6 -26.5 -29.1 -21.9 -26.1 -33.6 -21.3 -14.0 -10.1 2012 -11.3 -15.3 -22.1 -25.6 -23.4 -31.9 -31.8 -31.8 -29.8 -22.9 -17.0 -7.3 2013 -8.0 -17.4 -19.4 -32.2 -29.3 -34.6 -32.4 -30.0 -29.9 -23.6 -17.8 -9.6 2014 -10.2 -17.9 -24.3 -28.3 -22.6 -29.1 -35.5 -25.4 -22.3 - - - 2015 - - - - - - - - - - - - 2016 - -17.8 -25.5 -28.5 -26.3 -31.0 -32.2 -29.5 -31.4 -22.0 -17.0 -9.7 2017 -12.9 -14.7 -22.1 -20.4 -22.9 -28.5 -32.2 -29.7 -34.4 -22.5 -17.9 -11.7 2018 -11.6 -17.2 -21.0 -24.7 -30.4 -30.7 -28.9 -31.8 -31.2 -19.7 -15.7 -9.8 2019 -10.9 -14.9 -23.3 -27.0 -26.5 -26.3 -30.4 -27.8 -26.3 -24.5 -16.7 -10.6 2020 -11.9 -12.5 -26.4 -26.7 -23.0 -29.3 -30.0 -29.4 -29.5 -24.1 -19.5 -11.9 2021 -12.0 -18.1 -25.0 -33.4 -28.9 -24.5 -26.3 -36.1 -30.2 -24.1 -15.8 -11.8 2022 -10.9 -15.3 -21.8 -24.5 -24.2 -28.5 -26.4 -28.8 -27.3 -26.2 -19.7 -10.4 2023 -12.2 -15.6 -23.5 -27.3 -29.2 -28.9 -30.5 -39.3 -22.9 -27.4 -17.5 -11.2 2024 -12.2 -19.8 -20.5 -27.7 -24.5 -24.4 -32.0 -28.2 -32.2 - -19.6 -