Byrd 18Z temperature 1980 - - -24.5 -22.1 -26.1 -35.5 -25.7 -29.0 -34.2 -26.0 -21.5 -13.8 1981 - -22.4 -22.6 -31.9 -31.7 -29.4 -35.6 -43.4 -33.8 -28.1 -22.0 -14.4 1982 -13.4 -19.9 -29.7 -39.4 -35.7 -30.5 -37.3 -31.9 -35.2 -29.6 -20.7 -12.5 1983 -14.7 -25.4 -28.1 -28.6 -29.4 -39.7 -40.4 -42.4 -33.6 -30.2 -22.1 -14.9 1984 -15.0 -19.2 -21.6 -27.5 -29.8 -28.5 -39.9 -39.0 -36.8 -24.5 -19.4 -12.2 1985 -13.1 -22.3 -27.1 -28.4 -29.0 -30.0 -41.8 -39.7 -32.9 -27.6 -15.6 -15.0 1986 -14.5 -19.3 -28.1 -27.9 -26.9 -37.4 -35.2 -40.4 -44.5 -29.0 -20.1 -13.6 1987 -13.3 -18.5 -32.4 -33.0 -31.4 -28.6 -28.0 -32.9 -33.0 -27.1 -22.2 -13.2 1988 -12.9 -20.3 - - - - - - - - - - 1989 - - - - - - - - - - - - 1990 - -20.3 -33.0 -30.8 -28.7 -40.2 -37.8 -41.2 -32.0 - - - 1991 - -15.7 -29.9 -29.8 -30.5 -33.8 -36.2 -38.8 -32.6 -26.0 -20.3 -10.0 1992 -14.4 -22.7 -22.8 -29.8 -24.9 - - - - - - - 1993 - - - - - - - - - - - - 1994 - -21.4 -30.0 -26.3 -30.5 -33.1 -33.9 -40.0 -37.3 -25.1 -16.2 -11.4 1995 -13.6 -17.0 -30.0 -29.7 -36.6 -28.7 -37.0 -36.1 -32.9 -30.6 -21.2 -13.3 1996 -13.5 -20.8 -27.5 - - - - - - - - - 1997 - -20.8 -27.5 -34.1 -34.9 -28.6 -36.3 -39.8 -33.8 -23.5 -17.7 -9.3 1998 -12.8 -15.2 -27.4 -33.4 -25.3 -27.1 -41.7 -35.3 -36.1 -32.2 -21.7 -14.0 1999 -12.4 -22.1 -26.9 -33.7 -33.6 - - - - - - -13.9 2000 - - - - - -30.1 -30.3 -35.5 - - - - 2001 - - - - - - - - - - - - 2002 -11.1 -18.3 -19.3 - - - - - - - - -12.0 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - - - 2007 - - - -25.0 -26.5 -28.3 -29.5 -36.8 - - -16.2 -11.6 2008 -10.1 -17.3 -22.6 -29.0 -30.7 - - - - -22.9 - - 2009 - - - - - - - - - - - -