Marilyn 18Z temperature 1987 - -19.4 -28.8 -31.2 -28.7 - - - - - -17.5 -7.5 1988 -9.1 -18.0 -28.7 -27.6 -27.5 - -31.3 - - - - - 1989 - -19.8 -24.8 - - -35.2 -32.3 - - - - - 1990 - -16.8 -20.6 - - -29.2 - - - - - - 1991 - -14.5 -29.4 -26.7 -31.4 -27.8 -34.8 -33.1 -28.1 -26.4 -17.4 -6.7 1992 -8.1 -20.3 -24.5 -31.3 -27.2 -33.8 -28.3 -34.3 -32.5 -25.5 -18.1 -8.6 1993 -10.8 -19.4 -28.5 -26.7 - - -28.9 -35.5 -32.2 -30.5 -15.7 -11.8 1994 -9.2 -19.9 -30.2 -24.9 -37.6 -31.7 -31.4 -34.5 -35.1 -24.3 -14.8 -8.9 1995 -9.8 -16.4 -29.3 -32.1 -34.2 - - - - - -15.0 -7.1 1996 -8.8 -18.2 -27.4 -23.2 -32.2 -31.5 -33.8 -27.4 -29.7 -27.9 -15.2 -7.4 1997 -9.4 -21.8 -29.4 -31.7 -29.5 -30.0 -35.4 -34.4 -30.7 -21.9 -11.7 -8.4 1998 -10.9 -14.3 -26.9 -32.9 -30.9 -24.1 -32.4 -32.1 -34.4 -25.7 -17.5 -8.6 1999 -7.3 -18.4 -28.5 -35.6 -33.2 -31.9 -29.2 -35.6 -27.1 -24.2 -13.3 -9.0 2000 -10.3 -18.0 -23.6 -26.6 -29.1 -31.0 -30.5 - - - - - 2001 - -14.2 -27.5 -27.4 -30.2 -27.3 -28.2 -38.7 -28.1 -27.0 -16.5 -7.4 2002 -7.0 -16.8 -22.3 -26.8 -27.3 -35.8 -35.2 -35.9 -26.9 -24.2 -16.4 -9.5 2003 -6.7 -16.2 -26.2 -28.3 -27.6 -28.7 -28.2 -35.1 -30.9 -22.7 -17.9 -6.7 2004 -10.6 -19.7 -29.4 -26.4 -31.2 -30.6 -40.1 -35.3 -33.0 -27.5 -13.1 -6.1 2005 -6.5 -18.5 -26.3 -29.1 -27.4 -31.4 -30.7 -33.6 -30.0 -24.6 -15.5 -5.9 2006 -9.2 -15.7 -24.6 -33.7 -34.3 -27.9 -34.8 -26.4 -29.1 -26.4 -15.2 -8.5 2007 -6.5 -15.5 -25.4 -27.0 -26.9 -28.6 -30.2 -30.8 -27.7 -27.5 -14.8 -7.4 2008 -7.2 -17.0 -25.0 -26.8 -29.2 -25.4 -34.8 -40.2 -24.7 -24.3 -17.8 -8.0 2009 -9.2 -21.5 -28.1 -24.7 -32.4 -28.7 -31.0 -32.4 -32.2 -27.5 -12.3 -6.5 2010 -9.2 -16.2 -24.5 -26.8 -32.8 -31.9 -35.4 -32.5 -33.5 -23.5 -15.1 -7.5 2011 -8.1 -18.8 -24.7 -28.1 -28.3 -27.5 -24.4 -26.2 -31.3 -23.1 -13.4 -5.6 2012 -7.9 -14.7 -24.4 -27.4 -25.4 -33.3 -32.0 -32.6 -29.2 -25.3 -17.0 -4.9 2013 -6.2 -16.8 -22.4 -33.7 -28.0 -31.4 -33.8 -31.9 -29.2 -24.3 -16.1 -6.8 2014 -7.2 -16.3 -27.2 -29.2 -25.3 -31.1 -37.4 -26.1 -24.0 -20.7 -16.9 -10.5 2015 -8.9 -13.0 -26.8 -31.4 -32.0 -31.6 -34.5 -32.7 -33.9 -24.4 -17.1 -9.7 2016 -7.3 -18.9 -27.4 -34.8 -29.8 -33.5 -35.4 -33.4 -33.1 -28.1 -17.0 - 2017 -11.7 -18.7 -24.3 -25.1 -24.2 -30.4 -33.6 -30.2 -33.0 -23.6 -19.6 -10.3 2018 - -18.4 -23.5 -27.0 -30.5 -27.5 -33.1 -35.1 -32.0 -20.8 -15.0 - 2019 - -15.3 -26.1 -27.1 -25.8 -30.1 -28.8 -31.5 -29.6 -27.1 -16.8 -8.0 2020 -9.9 -14.1 -28.1 -29.8 -29.3 -30.9 - - -31.4 - -19.7 -9.4 2021 -8.9 -17.7 -26.6 -35.6 -32.0 - - - - - - - 2022 - -15.5 -23.8 -26.7 -24.6 -33.1 -27.8 -30.0 -30.0 -26.8 -22.0 -9.3 2023 -11.1 -17.9 -29.2 -28.8 -30.5 -29.1 -39.7 -40.0 -24.7 -28.6 -18.9 -10.7 2024 - -21.0 -27.5 -28.2 -30.7 -28.2 -32.2 -30.4 -34.0 -23.0 -20.1 -