Marilyn 12Z temperature 1987 - -19.5 -28.8 -31.2 -28.5 - - - - - - -7.9 1988 -9.2 -18.7 -28.0 -28.2 -27.4 - -32.2 - - - - - 1989 - -19.7 -24.3 - - -34.6 -30.5 -34.2 - - - - 1990 - -15.9 -20.3 - - -29.4 - - - - - - 1991 - -13.7 -28.7 -26.6 -31.4 -26.9 -34.3 -33.7 -27.5 -26.2 -17.6 -6.7 1992 -8.3 -20.2 -23.9 -31.6 -27.2 -33.2 -28.6 -33.8 -32.6 -26.0 -18.1 -8.6 1993 -9.9 -19.1 -27.3 -27.0 - - -29.3 -36.0 -32.0 -30.4 -16.2 -12.0 1994 -9.6 -19.2 -29.8 -24.0 -37.7 -30.7 -32.0 -34.9 -37.2 -23.8 -14.8 -8.9 1995 -9.9 -16.5 -28.0 -31.7 -36.2 - - - - - -15.3 -7.6 1996 -8.7 -17.3 -26.7 -23.1 -31.8 -31.4 -33.9 -27.3 -29.7 -28.2 -15.1 -7.0 1997 -8.6 -20.7 -29.4 -30.5 -29.6 -29.8 -35.8 -35.5 -29.8 -21.8 -12.2 -8.8 1998 -11.2 -13.9 -26.1 -32.4 -31.0 -23.7 -32.4 -32.3 -35.5 -25.3 -18.0 -9.4 1999 -7.0 -18.5 -27.4 -34.3 -32.7 -32.4 -28.3 -36.2 -26.0 -23.4 -14.0 -9.9 2000 -10.1 -17.6 -23.7 -26.4 -28.7 -31.5 -30.2 - - - - - 2001 - -13.8 -28.3 -27.3 -30.6 -27.3 -29.2 -39.5 -28.0 -27.2 -16.1 -7.3 2002 -6.5 -16.5 -22.3 -27.1 -26.0 -35.8 -36.4 -35.2 -27.7 -23.8 -15.9 -8.9 2003 -6.9 -16.2 -25.7 -29.8 -28.0 -28.5 -28.3 -35.4 -30.9 -22.8 -18.3 - 2004 -10.7 -19.6 -28.9 -26.5 -31.1 -30.6 -40.2 -35.2 -33.0 -27.8 -13.7 -6.4 2005 -6.8 -17.3 -25.7 -28.6 -26.7 -30.5 -30.6 -34.0 -29.5 -24.4 -14.6 -6.2 2006 -9.7 -15.4 -24.5 -33.4 -33.7 -28.0 -34.3 -26.4 -29.5 -27.2 -15.7 -8.8 2007 -6.0 -15.2 -24.8 -27.4 -26.9 -29.2 -29.6 -30.7 -28.4 -28.2 -15.7 -7.3 2008 -6.8 -17.1 -24.1 -26.9 -29.2 -25.7 -34.2 -39.4 -24.7 -23.6 -18.7 -8.8 2009 -8.8 -21.3 -28.0 -24.1 -31.3 -29.1 -30.6 -32.4 -33.2 -27.6 -12.6 -6.7 2010 -9.7 -16.8 -24.7 -27.1 -32.0 -31.7 -34.5 -32.4 -33.6 -23.5 -16.1 -7.3 2011 -8.9 -18.5 -24.3 -27.5 -29.1 -26.9 -24.7 -27.4 -31.5 -24.0 -13.8 -5.7 2012 -8.4 -16.0 -23.5 -26.6 -25.1 -33.3 -31.1 -32.5 -28.8 -25.0 -16.9 -5.7 2013 -6.0 -16.8 -22.8 -32.3 -28.2 -30.9 -33.2 -31.3 -28.0 -24.4 -16.6 -7.4 2014 -8.1 -16.5 -26.0 -28.7 -24.9 -32.8 -37.2 -26.0 -24.4 -20.9 -17.5 -9.9 2015 -8.4 -13.0 -27.6 -31.1 -32.4 -32.7 -34.2 -33.6 -34.7 -23.8 -17.3 -8.7 2016 -6.3 -18.1 -26.0 -34.1 -29.6 -33.2 -35.4 -31.6 -33.7 -27.3 -16.3 -8.3 2017 -9.8 - -23.8 - -24.3 -29.6 -33.5 -29.5 -33.6 -23.8 -18.9 -9.9 2018 - -17.9 -23.4 -26.4 -31.0 -27.6 -32.8 -34.5 -32.3 -20.8 -15.1 -7.2 2019 - -14.9 -25.4 -28.2 -25.9 -30.3 -29.0 -30.5 -29.4 -25.7 -16.4 -7.1 2020 -9.6 -12.5 -27.8 -29.6 -28.8 -32.0 -31.1 -29.1 -30.5 - -18.9 -8.4 2021 -8.2 -17.5 -26.1 -36.8 -31.6 - - - - - - - 2022 - -14.4 -22.0 -26.8 -24.6 -31.7 -27.9 -30.1 -30.1 -26.1 -21.0 -8.6 2023 -10.4 -16.7 -28.6 -29.3 -31.4 -29.3 -38.7 -40.6 -25.1 -27.6 -18.1 -10.1 2024 - -20.2 -27.0 -29.0 -31.5 -28.5 -32.3 -30.6 -34.4 -23.3 -19.5 -