Syowa 12Z 700hPa temperature 1959 - - - -19.8 - - -25.4 - - -23.3 - - 1960 - - -18.9 -22.5 -20.9 -27.4 -26.4 -26.8 -26.4 -23.9 -22.3 -17.5 1961 -17.7 -16.7 -22.0 -22.8 -22.8 -24.1 -26.9 -25.8 -23.1 -21.8 -20.4 -18.9 1962 - - - - - - - - - - - - 1963 - - - - - - - - - - - - 1964 - - - - - - - - - - - - 1965 - - - - - - - - - - - - 1966 - -18.4 -19.8 -21.8 -22.3 -26.8 -25.4 -28.0 -23.8 -24.4 -19.8 -16.6 1967 -15.1 -19.1 -19.7 -22.6 -22.9 -23.8 -25.7 -25.6 -24.4 -21.7 -20.2 -17.9 1968 -17.5 -16.5 - - - - - - - - - - 1969 - - - - - - - - - - - - 1970 - - - - - - - - - - - - 1971 - - - - - - - - - - - - 1972 - - - - - - - - - - - - 1973 - - - - - - - - - - - - 1974 - - -19.1 -22.5 -22.1 -23.6 -25.3 -25.4 -24.9 -23.5 -19.0 -15.9 1975 -14.7 -16.9 -18.1 -23.2 -20.5 -24.7 -24.9 -25.9 -25.9 -24.9 -20.2 -17.6 1976 -14.9 -18.3 -20.0 -22.1 -25.1 -22.9 -27.6 -26.0 -26.8 -25.2 -19.9 -14.4 1977 -15.0 -17.0 -19.6 -21.6 -20.5 -23.3 -22.9 -23.8 -25.6 -23.5 -21.0 -18.1 1978 -18.7 -17.3 -20.2 -21.7 -24.0 -25.5 -25.2 -29.4 -24.5 -22.3 -20.4 -18.5 1979 -15.9 -17.9 -18.6 -19.2 -22.0 -27.6 -27.9 -27.6 -25.2 -22.5 -17.9 -15.3 1980 -15.9 -19.0 -18.8 -20.7 -21.5 -24.7 -22.8 -25.8 -24.3 -25.2 -18.4 -18.3 1981 -17.4 -15.6 -20.4 -23.2 -22.4 -25.4 -21.8 -23.4 -24.8 -26.4 -21.1 -16.9 1982 -17.3 -18.2 -19.8 -21.0 -22.5 -25.0 -26.4 -25.8 -25.7 -24.3 -18.3 -14.8 1983 -17.2 -18.0 -20.0 -20.0 -22.0 -24.6 -25.9 -28.2 -23.5 -23.4 -22.1 -19.2 1984 -16.6 -17.7 -19.3 -22.3 -20.2 -25.4 -25.0 -25.6 -25.6 -25.1 -19.9 -15.1 1985 -15.6 -17.4 -19.4 -20.5 -25.5 -23.0 -24.2 -27.8 -25.1 -24.7 -20.2 -18.9 1986 -15.5 -16.4 -18.7 -21.4 -23.4 -25.0 -25.2 -24.1 -24.9 -23.8 -19.6 -18.8 1987 -16.1 -16.7 -18.7 -20.9 -21.4 -23.4 -24.7 -26.1 -26.7 -23.8 -18.7 -17.9 1988 -15.1 -18.0 -16.9 -22.7 -22.4 -22.3 -25.2 -26.9 -23.6 -22.3 -22.9 -17.3 1989 -16.5 -17.4 -19.5 -22.3 -25.3 -23.6 -26.5 -26.8 -26.4 -24.1 -20.1 -17.2 1990 -16.9 -18.6 -19.6 -21.4 -21.2 -24.2 -21.3 -27.8 -29.2 -21.9 -20.1 -18.2 1991 -18.0 -15.8 -19.9 -22.5 -22.4 -23.1 -24.3 -24.8 -25.7 -24.2 -21.4 -14.5 1992 -15.4 -18.1 -18.0 -21.2 -21.0 -22.6 -24.4 -27.4 -28.5 -24.3 -22.1 -18.0 1993 -15.3 -18.0 -20.1 -22.4 -22.4 -23.1 -25.8 -24.9 -23.9 -22.3 -21.2 -17.7 1994 -18.6 -19.0 -19.6 -20.9 -23.6 -23.2 -25.1 -25.1 -26.0 -23.1 -20.9 -18.4 1995 -17.4 -17.3 -19.0 -20.6 -24.2 -25.7 -24.2 -25.7 -27.5 -22.5 -22.0 -16.9 1996 -17.2 -16.0 -20.7 -22.3 -24.1 -22.5 -21.9 -23.4 -20.8 -22.9 -20.7 -18.0 1997 -17.7 -17.6 -19.9 -21.0 -22.6 -22.3 -24.7 -25.4 -26.0 -24.6 -17.9 -17.9 1998 -17.9 -19.0 -19.0 -23.2 -20.8 -23.1 -24.3 -25.1 -25.7 -24.8 -21.2 -19.0 1999 -17.0 -17.9 -20.5 -23.3 -23.0 -23.0 -27.9 -24.6 -24.4 -24.5 -22.1 -19.4 2000 -18.5 -18.8 -23.1 -22.2 -24.3 -22.2 -24.9 -23.8 -24.9 -23.9 -20.1 -18.8 2001 -17.3 -17.5 -20.0 -21.5 -22.1 -22.0 -22.8 -26.9 -27.2 -23.1 -21.6 -17.8 2002 -16.5 -18.5 -18.3 -18.8 -20.4 -22.9 -23.4 -25.2 -25.3 -21.4 -22.2 -17.7 2003 -17.7 -17.5 -19.7 -20.9 -22.8 -24.6 -26.2 -26.0 -25.9 -24.0 -18.7 -15.8 2004 -17.1 -17.3 -19.0 -22.7 -24.3 -23.7 -28.1 -27.4 -27.9 -23.4 -21.7 -17.3 2005 -17.5 -17.6 -18.4 -22.3 -23.4 -23.5 -23.7 -23.9 -26.9 -25.5 -24.4 -16.2 2006 -16.8 -19.9 -20.7 -21.2 -22.0 -22.9 -28.0 -21.9 -25.7 -25.8 -19.6 -19.0 2007 -16.9 -18.6 -20.5 -21.4 -22.6 -22.2 -23.4 -25.8 -26.0 -22.0 -17.1 -19.2 2008 -18.2 -18.8 -19.3 -18.7 -22.3 -25.1 -23.1 -27.8 -24.5 -25.1 -21.2 -17.5 2009 -17.3 -18.4 -17.8 -23.3 -20.7 -19.8 -23.6 -27.1 -25.5 -23.5 -19.6 -17.8 2010 -15.6 -16.2 -19.8 -22.0 -24.3 -26.5 -25.5 -27.4 -25.2 -26.2 -21.4 -18.4 2011 -15.2 -17.6 -19.3 -20.5 -23.0 -20.9 -24.6 -24.4 -24.8 -23.5 -20.0 -18.4 2012 -17.1 -16.6 -21.3 -22.4 -21.3 -26.5 -25.7 -25.1 -26.2 -22.0 -17.5 -16.0 2013 -15.4 -16.8 -19.9 -23.1 -23.4 -23.0 -26.6 -25.6 -24.2 -24.7 -18.3 -17.5 2014 -16.9 -17.6 -20.3 -23.7 -21.7 -23.8 -25.6 -25.4 -26.7 -24.2 -21.7 -17.9 2015 -17.4 -18.2 -19.9 -22.9 -22.4 -24.4 -26.8 -26.0 -26.3 -22.1 -17.7 -19.0 2016 -17.4 -17.6 -18.5 -19.9 -21.9 -24.6 -26.3 -23.1 -25.2 -21.1 -19.5 -16.7 2017 -16.3 -17.0 -19.8 -22.9 -22.6 -25.7 -23.7 -28.1 -26.7 -23.4 -18.4 -18.0 2018 -15.8 -17.4 -19.2 -20.0 -21.1 -21.5 -25.6 -24.0 -25.2 -22.5 -21.2 -17.7 2019 -15.2 -14.1 -20.1 -22.2 -23.9 -23.7 -25.3 -26.0 -28.2 -19.9 -19.4 -16.1 2020 -15.2 -18.1 -19.5 -21.3 -21.7 -23.6 -25.4 -26.9 -23.3 -25.9 - - 2021 - - -16.7 -21.8 -22.7 -25.2 -25.3 -25.4 -22.7 -22.9 -20.2 -15.9 2022 -13.5 -17.9 -18.4 -20.7 -22.6 -23.2 -24.4 -25.6 -28.2 -23.3 -19.6 -19.9 2023 -16.4 -17.8 -17.9 -21.4 -20.7 -24.1 -23.5 -24.5 - -21.9 -19.1 -16.0 2024 -17.2 -17.2 -20.3 -21.9 - - - - - - - -