Syowa 12Z 150hPa temperature 1959 - - - -52.4 - - -73.4 - - -70.8 - - 1960 - - -45.7 -52.1 -61.3 -69.9 - - -74.8 -69.0 -58.2 -43.8 1961 -41.3 -43.1 -45.1 -50.4 -57.7 -66.2 -71.9 -74.2 -74.2 -67.6 -56.4 -48.8 1962 - - - - - - - - - - - - 1963 - - - - - - - - - - - - 1964 - - - - - - - - - - - - 1965 - - - - - - - - - - - - 1966 - -42.8 -44.2 -51.0 -55.8 -65.9 -73.2 -75.8 -74.1 -67.1 -54.4 -42.9 1967 -42.2 -44.7 -47.0 -52.3 -61.6 -67.3 -74.0 -75.1 -72.6 -64.5 -52.4 -41.8 1968 -42.1 -43.8 - - - - - - - - - - 1969 - - - - - - - - - - - - 1970 - - - - - - - - - - - - 1971 - - - - - - - - - - - - 1972 - - - - - - - - - - - - 1973 - - - - - - - - - - - - 1974 - - -47.0 -52.9 -59.6 -67.0 -71.5 -75.5 -70.9 -66.1 -54.9 -43.7 1975 -41.6 -42.0 -45.2 -52.7 -61.8 -68.7 -72.6 -71.6 -71.9 -66.9 -56.6 -45.7 1976 -43.3 -42.7 -46.9 -51.5 -60.3 -68.5 -73.2 -75.8 -72.5 -70.3 -55.0 -44.9 1977 -41.9 -43.7 -47.1 -54.2 -59.5 -65.0 -75.4 -74.3 -71.5 -64.8 -58.0 -43.3 1978 -40.8 -42.6 -45.6 -50.3 -60.8 -66.4 -72.3 -74.5 -72.3 -66.5 -56.3 -42.8 1979 -41.2 -42.7 -46.3 -52.4 -62.1 -67.3 -73.1 -74.2 -74.1 -63.4 -52.3 -43.0 1980 -40.9 -43.3 -47.5 -50.2 -57.9 -63.5 -72.2 -71.5 -73.4 -68.8 -59.0 -45.3 1981 -43.9 -45.0 -48.1 -55.0 -61.1 -66.4 -72.1 -73.9 -72.2 -66.7 -59.5 -45.3 1982 -44.5 -44.6 -48.0 -53.0 -63.6 -68.0 -73.0 -75.4 -74.2 -71.1 -56.3 -48.1 1983 -44.1 -44.6 -48.4 -54.6 -61.6 -69.1 -73.6 -75.6 -73.2 -70.5 -61.2 -45.6 1984 -44.8 -45.6 -48.6 -53.8 -60.8 -67.5 -73.4 -75.8 -74.2 -69.8 -61.7 -48.6 1985 -43.9 -45.6 -48.3 -52.7 -59.6 -70.9 -72.3 -74.3 -75.1 -72.8 -65.5 -52.0 1986 -45.7 -45.6 -48.8 -54.4 -60.5 -67.1 -70.5 -74.3 -75.4 -68.2 -64.4 -51.0 1987 -44.2 -46.6 -48.6 -53.6 -62.8 -68.9 -72.3 -77.9 -75.6 -71.8 -66.6 -53.4 1988 -44.7 -45.7 -50.4 -54.0 -61.9 -67.4 -73.5 -73.7 -70.7 -67.9 -54.7 -43.4 1989 -44.6 -44.9 -48.1 -54.5 -59.5 -68.3 -73.7 -76.5 -73.3 -71.3 -63.0 -47.3 1990 -44.5 -44.2 -48.0 -53.7 -60.6 -70.3 -72.3 -74.3 -75.2 -68.8 -59.7 -53.7 1991 -45.4 -47.0 -48.3 -53.2 -61.1 -66.3 -71.9 -74.9 -74.3 -65.4 -62.5 -47.5 1992 -45.0 -44.4 -49.5 -55.9 -60.1 -67.0 -71.0 -75.1 -74.9 -72.7 -62.9 -51.8 1993 -48.2 -44.9 -48.4 -54.5 -63.8 -70.7 -73.2 -76.2 -75.3 -72.3 -66.2 -53.8 1994 -46.2 -45.8 -49.5 -53.7 -60.3 -66.9 -72.9 -76.8 -75.3 -71.4 -63.8 -48.5 1995 -44.7 -45.8 -48.5 -53.9 -61.1 -69.0 -74.6 -72.9 -72.2 -73.9 -67.0 -56.3 1996 -45.8 -47.0 -48.2 -53.6 -61.9 -67.8 -73.6 -72.9 -74.6 -72.4 -65.9 -54.3 1997 -44.0 -44.6 -48.1 -54.2 -60.6 -70.6 -72.9 -75.6 -71.4 -73.7 -60.3 -50.6 1998 -45.5 -46.1 -49.1 -54.1 -62.7 -67.6 -73.6 -76.5 -76.2 -72.3 -67.8 -57.6 1999 -47.2 -46.9 -48.3 -54.7 -59.8 -68.5 -72.7 -76.4 -74.9 -71.9 -69.3 -63.2 2000 -46.0 -45.5 -48.9 -54.0 -60.9 -69.9 -74.2 -78.3 -76.5 -70.0 -62.8 -45.3 2001 -43.9 -45.1 -48.3 -53.2 -62.8 -69.0 -73.9 -76.7 -75.7 -75.4 -68.7 -55.2 2002 -44.1 -44.4 -48.4 -53.0 -59.7 -64.1 -71.7 -74.5 -71.2 -60.3 -54.8 -45.5 2003 -44.9 -44.6 -47.5 -53.8 -63.1 -67.5 -73.8 -76.4 -77.0 -73.3 -61.6 -52.0 2004 -45.0 -45.8 -48.1 -51.6 -60.0 -68.3 -72.7 -76.0 -72.2 -71.6 -64.2 -50.3 2005 -44.4 -44.8 -47.9 -54.4 -59.8 -69.7 -74.1 -76.5 -74.9 -69.7 -64.7 -47.8 2006 -45.5 -46.9 -48.2 -53.4 -62.3 -70.6 -71.9 -78.1 -77.1 -75.0 -69.7 -60.5 2007 -47.8 -45.7 -47.6 -54.6 -61.9 -66.6 -74.7 -75.4 -78.1 -73.6 -64.0 -52.9 2008 -45.8 -45.3 -48.0 -53.3 -58.5 -68.1 -74.1 -76.0 -76.4 -73.0 -65.6 -59.0 2009 -47.4 -45.0 -48.6 -54.0 -61.4 -67.5 -72.6 -75.2 -75.4 -73.0 -55.1 -52.7 2010 -45.6 -45.4 -48.7 -54.8 -61.8 -67.9 -74.9 -75.8 -75.1 -72.6 -66.9 -52.1 2011 -46.5 -45.6 -49.6 -54.0 -60.0 -69.8 -73.4 -74.5 -76.6 -70.2 -68.2 -55.3 2012 -48.4 -47.7 -47.8 -52.6 -61.9 -67.6 -72.4 -76.0 -74.9 -70.7 -52.1 -45.5 2013 -44.6 -44.6 -47.5 -54.3 -62.1 -68.6 -72.4 -75.8 -72.9 -68.8 -52.1 -44.9 2014 -45.0 -45.5 -48.6 -54.1 -60.6 -68.2 -74.6 -76.7 -75.6 -71.8 -63.3 -52.4 2015 -46.3 -45.2 -48.8 -53.8 -63.1 -69.2 -74.6 -76.8 -75.6 -75.8 -70.4 -58.6 2016 -49.1 -45.6 -49.3 -56.2 -62.7 -68.4 -73.4 -75.5 -73.5 -72.4 -61.5 -46.8 2017 -45.2 -45.4 -48.3 -54.5 -62.4 -69.5 -74.8 -75.5 -73.0 -70.2 -54.7 -45.7 2018 -44.9 -45.4 -48.8 -53.3 -62.3 -68.0 -73.0 -76.9 -75.9 -71.9 -64.7 -45.7 2019 -46.4 -46.0 -47.8 -53.5 -60.0 -69.1 -74.8 -77.8 -70.0 -68.2 -52.3 -47.3 2020 -44.4 -44.2 -47.9 -55.3 -62.4 -70.4 -73.9 -76.9 -74.4 -74.7 - - 2021 - - -48.8 -55.3 -62.2 -69.1 -74.0 -77.0 -77.3 -74.2 -69.8 -59.3 2022 -46.3 -46.0 -48.7 -53.7 -63.7 -70.3 -74.1 -76.4 -76.6 -74.4 -68.0 -59.8 2023 -46.1 -46.5 -48.9 -54.3 -62.8 -68.9 -75.1 -75.3 - -73.1 -65.4 -51.9 2024 -48.0 -46.6 -50.0 -54.2 - - - - - - - -