Syowa 12Z 300hPa temperature 1959 - - - -55.0 - - -62.9 - - -58.2 - - 1960 - - -53.6 -54.6 -57.7 -63.9 -63.7 -63.4 -63.7 -59.9 -57.1 -51.4 1961 -48.7 -52.1 -54.5 -54.8 -56.3 -59.8 -63.2 -62.7 -59.9 -58.8 -56.8 -53.8 1962 - - - - - - - - - - - - 1963 - - - - - - - - - - - - 1964 - - - - - - - - - - - - 1965 - - - - - - - - - - - - 1966 - -46.9 -48.5 -55.0 -55.7 -61.3 -61.3 -63.1 -61.2 -59.6 -55.6 -51.1 1967 -49.7 -52.7 -54.9 -56.5 -59.5 -61.3 -62.1 -62.5 -60.7 -59.2 -56.9 -50.1 1968 -51.2 -49.9 - - - - - - - - - - 1969 - - - - - - - - - - - - 1970 - - - - - - - - - - - - 1971 - - - - - - - - - - - - 1972 - - - - - - - - - - - - 1973 - - - - - - - - - - - - 1974 - - -54.1 -54.8 -58.1 -60.1 -62.2 -61.4 -61.8 -61.0 -56.5 -51.8 1975 -51.4 -50.0 -51.9 -56.0 -58.6 -61.5 -62.1 -62.5 -60.5 -59.3 -55.8 -52.6 1976 -50.8 -51.9 -55.9 -55.3 -60.4 -60.7 -63.5 -63.7 -61.2 -62.4 -56.4 -50.3 1977 -51.1 -51.9 -55.6 -57.5 -57.2 -58.3 -60.4 -62.0 -61.8 -59.9 -57.8 -53.6 1978 -52.5 -52.0 -53.9 -55.5 -57.9 -61.9 -62.8 -64.1 -62.0 -59.1 -56.2 -52.4 1979 -50.2 -52.6 -54.1 -56.4 -58.8 -61.7 -62.0 -63.7 -63.5 -58.4 -55.4 -52.7 1980 -48.9 -49.8 -54.3 -56.2 -58.2 -60.6 -60.1 -61.2 -60.7 -61.1 -57.3 -54.1 1981 -50.5 -50.7 -53.9 -58.9 -58.5 -61.5 -60.0 -61.3 -60.7 -58.9 -57.9 -50.9 1982 -52.6 -53.0 -54.2 -56.1 -59.9 -61.6 -63.0 -63.4 -61.8 -59.8 -54.1 -52.1 1983 -52.3 -52.7 -55.2 -56.9 -57.8 -60.7 -63.0 -63.1 -61.4 -60.4 -57.6 -54.3 1984 -53.1 -52.1 -53.5 -56.9 -56.7 -62.5 -61.4 -62.5 -63.3 -60.8 -58.0 -51.9 1985 -52.3 -53.5 -51.8 -54.5 -58.9 -61.2 -62.2 -61.9 -62.1 -61.3 -58.4 -53.9 1986 -51.5 -51.3 -53.9 -55.1 -59.8 -60.3 -60.5 -62.1 -63.0 -60.1 -57.0 -55.1 1987 -51.7 -52.7 -55.5 -57.1 -59.5 -61.7 -61.4 -63.4 -63.5 -59.3 -55.9 -54.0 1988 -50.6 -52.6 -52.8 -56.7 -60.1 -59.9 -63.8 -63.2 -60.6 -59.9 -54.3 -51.2 1989 -51.9 -49.8 -53.8 -57.2 -59.1 -61.5 -62.8 -63.0 -62.0 -61.0 -56.8 -52.5 1990 -51.4 -49.7 -51.9 -56.6 -58.7 -62.5 -60.5 -62.6 -64.5 -58.8 -55.9 -54.1 1991 -51.4 -51.3 -54.2 -58.4 -59.8 -58.3 -62.2 -62.4 -62.5 -59.4 -58.5 -50.4 1992 -51.1 -52.0 -54.5 -57.5 -57.3 -59.6 -62.3 -65.0 -63.6 -60.8 -57.4 -54.9 1993 -52.9 -52.6 -54.9 -56.1 -58.4 -61.1 -61.5 -62.2 -61.1 -60.3 -57.0 -55.0 1994 -53.2 -51.7 -54.8 -55.9 -59.4 -58.9 -61.6 -62.3 -62.2 -59.9 -56.9 -52.0 1995 -52.1 -52.5 -52.8 -57.7 -58.9 -61.6 -61.5 -62.2 -63.4 -60.0 -58.7 -53.7 1996 -52.6 -50.4 -53.1 -55.4 -59.9 -60.2 -60.7 -60.7 -60.5 -61.0 -57.5 -53.6 1997 -51.7 -51.0 -55.3 -57.4 -60.2 -61.2 -63.2 -63.1 -61.5 -61.3 -55.0 -53.6 1998 -52.5 -52.7 -55.4 -56.7 -58.0 -60.3 -61.8 -63.6 -62.7 -60.9 -58.2 -54.5 1999 -51.1 -51.6 -54.2 -58.5 -59.5 -60.6 -61.6 -61.3 -60.9 -60.4 -58.1 -57.4 2000 -52.8 -52.2 -55.4 -55.5 -58.3 -58.8 -62.8 -62.6 -60.0 -61.3 -57.2 -52.7 2001 -50.6 -52.2 -55.8 -55.6 -58.9 -59.1 -59.9 -64.2 -62.6 -60.9 -58.5 -54.8 2002 -52.2 -51.5 -54.1 -54.8 -56.7 -58.4 -60.3 -61.5 -62.9 -57.3 -56.0 -50.1 2003 -51.8 -52.2 -53.5 -56.9 -58.1 -61.1 -62.4 -62.9 -63.0 -61.8 -56.1 -53.3 2004 -51.5 -52.2 -53.2 -57.6 -59.2 -60.1 -63.2 -65.4 -62.0 -60.5 -59.0 -53.9 2005 -51.3 -50.9 -52.5 -55.9 -58.4 -62.3 -62.2 -63.1 -63.6 -60.3 -58.1 -52.1 2006 -51.7 -53.4 -54.6 -57.7 -59.2 -60.8 -62.6 -61.4 -62.9 -61.1 -57.2 -56.6 2007 -52.0 -53.6 -53.7 -55.7 -57.9 -59.1 -60.9 -61.1 -62.4 -60.3 -55.4 -54.1 2008 -53.8 -51.8 -52.9 -55.0 -57.1 -60.1 -60.6 -63.4 -62.5 -61.2 -57.9 -56.0 2009 -51.2 -51.6 -53.6 -57.0 -55.5 -57.7 -60.9 -62.0 -62.2 -60.2 -55.1 -54.6 2010 -51.0 -51.9 -54.3 -58.5 -57.5 -62.0 -63.1 -63.1 -61.2 -60.1 -59.0 -53.4 2011 -51.2 -50.1 -54.6 -55.4 -57.8 -58.7 -60.7 -60.6 -61.1 -59.8 -57.8 -54.6 2012 -53.4 -51.4 -54.6 -55.4 -59.4 -60.5 -61.9 -62.0 -61.7 -59.1 -53.3 -51.2 2013 -50.2 -52.5 -55.1 -55.9 -60.8 -59.4 -61.5 -61.4 -61.5 -59.4 -51.2 -51.6 2014 -53.2 -52.5 -54.8 -57.8 -57.7 -61.8 -62.7 -60.9 -61.8 -60.3 -57.7 -54.5 2015 -51.9 -51.7 -54.0 -56.3 -59.4 -61.9 -63.6 -63.1 -61.9 -59.3 -57.4 -55.3 2016 -52.8 -50.5 -52.9 -54.9 -58.9 -62.4 -62.8 -60.5 -61.8 -58.1 -55.6 -54.1 2017 -51.4 -52.8 -53.2 -56.9 -59.5 -63.4 -61.9 -64.4 -61.9 -58.1 -53.3 -50.6 2018 -51.0 -51.2 -52.4 -57.4 -59.2 -59.5 -62.7 -62.5 -62.5 -60.4 -56.8 -51.5 2019 -51.4 -51.2 -55.9 -55.7 -58.8 -60.8 -64.5 -65.5 -61.8 -59.9 -56.1 -52.5 2020 -50.6 -52.2 -54.5 -57.1 -58.9 -59.9 -62.7 - -62.8 -62.1 - - 2021 - - -52.2 -58.2 -59.9 -63.0 -61.5 -63.6 -62.0 -60.2 -56.8 -54.5 2022 -49.4 -52.6 -55.1 -55.8 -59.6 -61.2 -62.0 -62.5 -63.2 -61.2 -58.1 -55.5 2023 -51.0 -53.9 -52.7 -55.6 -60.0 -61.7 -61.4 -61.3 - -59.9 -56.6 -54.5 2024 -52.0 -51.1 -55.4 -56.2 - - - - - - - -