Syowa 00Z 150hPa temperature 1968 - - -47.7 -53.8 -58.6 -66.7 -73.1 -76.6 -75.6 -69.0 -47.4 -42.9 1969 -43.8 -45.5 -48.0 -53.7 -58.8 -68.2 -72.1 -73.0 -73.1 -71.6 -62.7 -48.8 1970 -43.1 -44.7 -47.2 -53.9 -59.7 -64.7 -73.6 -74.6 -74.2 -71.4 -55.6 -48.2 1971 -42.6 -43.4 -47.6 -53.1 -59.6 -65.4 -72.9 -72.0 -74.3 -68.4 -52.4 -46.1 1972 -43.6 -44.9 -48.2 -54.8 -62.3 -70.1 -73.0 -73.8 -74.8 -68.6 -54.2 -46.7 1973 -43.7 -44.7 -47.8 -53.2 -63.0 -67.3 -72.0 -75.3 -72.8 -70.5 -61.4 -44.5 1974 -44.3 -44.4 -48.6 -53.1 -60.1 -66.8 -71.4 -76.2 -72.5 -67.9 -56.3 -44.5 1975 -42.9 -43.9 -47.1 -53.6 -61.7 -68.6 -72.7 -72.1 -73.4 -68.5 -57.7 -46.6 1976 -44.0 -43.9 -48.3 -52.5 -61.1 -68.2 -73.0 -76.8 -73.6 -71.7 -56.4 -45.5 1977 -43.1 -45.4 -48.8 -55.0 -59.9 -65.3 -74.8 -75.2 -73.6 -66.6 -59.0 -44.7 1978 -41.7 -44.5 -47.3 -51.3 -60.8 -66.2 -72.1 -75.1 -73.8 -68.6 -57.2 -44.4 1979 -42.3 -44.6 -48.4 -53.5 -62.0 -67.1 -73.3 -75.0 -75.5 -65.1 -53.6 -44.1 1980 -42.3 -43.8 -48.3 -51.0 -57.3 -63.4 -71.8 -71.5 -73.3 -69.4 -59.7 -46.2 1981 -44.7 -45.2 -48.3 -55.0 -60.8 -67.1 -72.1 -73.3 -72.5 -67.2 -59.5 -45.8 1982 -45.2 -45.1 -48.2 -53.2 -63.4 -67.5 -73.0 -75.4 -74.7 -72.1 -56.6 -48.9 1983 -45.2 -45.2 -48.6 -54.6 -61.1 -68.8 -73.4 -75.3 -73.7 -71.4 -62.1 -46.4 1984 -45.5 -46.2 -48.9 -53.8 -60.6 -67.5 -73.3 -75.9 -74.6 -69.8 -62.6 -49.4 1985 -44.6 -46.1 -48.8 -52.3 -59.8 -70.9 -71.9 -74.4 -75.7 -73.3 -66.4 -52.8 1986 -46.8 -46.0 -49.0 -54.2 -60.1 -66.8 -70.5 -74.5 -75.3 -69.0 -65.2 -51.8 1987 -45.3 -46.7 -48.9 -53.4 -62.9 -68.7 -72.0 -78.0 -75.8 -72.4 -67.2 -54.5 1988 -45.5 -46.2 -50.2 -53.6 -61.9 -67.4 -73.5 -74.0 -70.9 -68.4 -55.4 -44.0 1989 -45.6 -45.4 -47.9 -54.5 -59.6 -67.8 -73.6 -76.9 -73.7 -71.7 -63.7 -48.1 1990 -45.0 -44.6 -48.0 -53.4 -60.4 -69.9 -72.2 -74.0 -75.4 -69.8 -60.9 -54.3 1991 -46.3 -47.3 -48.4 -53.2 -61.1 -66.2 -72.5 -74.7 -74.6 -65.8 -63.8 -47.9 1992 -46.2 -44.7 -49.6 -55.5 -60.8 -66.7 -70.8 -75.0 -75.1 -73.3 -64.3 -52.7 1993 -49.0 -45.6 -48.7 -54.3 -64.0 -70.6 -73.0 -76.2 -75.5 -73.0 -67.0 -54.9 1994 -47.0 -46.1 -49.8 -53.5 -59.8 -66.9 -72.9 -76.7 -75.6 -72.0 -64.2 -49.1 1995 -45.2 -46.0 -48.7 -53.4 -60.7 -68.7 -74.6 -72.8 -72.0 -73.8 -67.6 -57.4 1996 -46.5 -47.8 -47.9 -53.2 -61.4 -67.8 -73.1 -72.6 -74.2 -72.9 -66.8 -55.0 1997 -44.7 -44.9 -47.9 -53.4 -60.5 -70.9 -73.3 -75.2 -71.3 -74.1 -60.3 -51.4 1998 -46.1 -46.3 -49.2 -53.7 -62.6 -67.7 -73.3 -76.3 -76.2 -72.5 -68.7 -58.7 1999 -47.9 -47.2 -48.2 -54.2 -59.6 -68.6 -72.7 -75.8 -75.0 -72.4 -70.3 -64.1 2000 -46.8 -46.5 -49.0 -53.6 -60.6 -69.6 -74.1 -77.9 -76.4 -70.2 -63.7 -45.8 2001 -44.7 -45.2 -48.0 -53.1 -62.6 -68.5 -74.3 -76.1 -75.6 -75.8 -69.8 -56.1 2002 -44.7 -44.8 -48.4 -52.1 -59.2 -63.9 -72.0 -74.2 -71.1 -60.9 -55.4 -46.1 2003 -45.3 -44.9 -47.1 -53.3 -62.4 -67.3 -73.8 -75.8 -76.9 -73.7 -62.3 -52.6 2004 -45.2 -45.9 -48.1 -51.6 -59.8 -68.0 -72.8 -76.0 -72.5 -71.8 -64.9 -51.1 2005 -44.9 -44.8 -47.7 -54.3 -59.2 -69.8 -74.0 -76.0 -74.7 -69.9 -65.2 -48.6 2006 -46.0 -47.0 -48.4 -52.8 -62.0 -70.8 -72.3 -77.2 -77.1 -75.3 -70.7 -61.0 2007 -48.4 -45.8 -47.5 -53.7 -61.7 -66.5 -75.0 -75.0 -77.9 -73.9 -64.8 -53.9 2008 -46.2 -45.7 -48.3 -52.8 -59.1 -66.7 -73.8 -75.6 -76.6 -73.1 -66.3 -59.7 2009 -48.0 -45.2 -48.4 -53.6 -62.0 -67.1 -72.2 -75.1 -75.0 -73.2 -56.0 -53.3 2010 -46.4 -45.6 -48.6 -54.5 -62.2 -67.9 -74.5 -75.3 -74.7 -72.7 -67.7 -52.3 2011 -47.6 -45.5 -49.5 -53.7 -60.0 -69.2 -73.2 -73.9 -76.7 -70.4 -68.9 -56.1 2012 -48.9 -47.8 -47.6 -52.2 -61.8 -67.7 -72.5 -75.7 -74.5 -70.3 -53.1 -46.0 2013 -45.3 -44.8 -47.3 -53.6 -61.8 -68.4 -71.9 -75.5 -72.9 -68.6 -53.6 -45.2 2014 -45.6 -45.8 -48.4 -53.5 -60.2 -68.2 -74.6 -76.1 -75.6 -71.7 -63.9 -53.0 2015 -46.9 -45.4 -48.4 -53.5 -62.9 -68.3 -73.5 -76.2 -75.4 -76.0 -71.4 -59.4 2016 -49.0 -45.5 -49.0 -54.9 -62.3 -67.9 -73.9 -75.2 -73.9 -72.7 -61.8 -48.9 2017 -45.0 - -49.1 -55.8 -61.2 -69.1 -74.2 -75.5 -74.9 - - - 2018 - -44.8 -49.0 -52.7 -64.2 -68.2 -72.8 -77.0 -74.7 -72.2 - -45.8 2019 -46.6 - - -52.0 -62.6 -67.0 -73.8 -76.2 -69.4 -70.0 - - 2020 - -44.5 - -55.1 -63.1 -69.1 -73.7 -76.7 -74.5 -73.8 -71.5 - 2021 - -45.4 -49.5 -55.8 -62.7 -67.9 -73.3 -77.5 -76.4 -73.2 -71.9 -61.0 2022 -46.6 -46.0 -49.2 -53.7 -63.1 -70.4 - -76.7 - -75.4 -70.7 - 2023 - - -48.5 -54.9 -62.1 -68.6 -75.7 -74.7 - -72.0 -67.2 -54.4 2024 -48.4 -46.6 -49.4 -52.8 - - - - - - - -