Halley 12Z msl_pressure 1957 994.0 989.6 987.1 988.5 993.6 987.6 983.9 993.5 990.2 990.2 994.1 997.5 1958 989.6 993.7 985.9 991.0 995.3 989.1 991.8 982.1 980.2 980.5 988.8 986.9 1959 988.5 986.5 990.0 987.0 986.6 996.7 984.2 993.1 986.8 981.9 977.2 991.3 1960 988.0 991.0 978.2 988.5 994.0 991.4 983.5 986.1 989.0 986.6 982.8 986.9 1961 993.0 998.6 992.1 990.4 987.3 995.3 990.7 988.6 993.3 972.9 984.7 984.5 1962 986.8 989.9 985.3 984.1 991.3 999.7 986.4 986.7 986.2 984.2 989.7 988.9 1963 984.6 988.9 980.9 989.8 995.9 986.3 988.2 997.6 991.1 987.7 981.4 991.6 1964 996.4 991.8 985.3 987.1 982.6 1004.6 1008.2 991.0 981.2 980.4 993.9 993.6 1965 995.9 1000.8 986.9 991.3 996.6 982.1 991.2 994.1 989.5 987.1 979.3 999.0 1966 989.5 994.1 993.6 977.4 994.0 990.7 991.9 980.4 981.5 983.3 991.6 991.7 1967 997.4 995.4 989.8 993.6 992.0 992.4 986.2 986.9 988.2 984.7 989.1 991.1 1968 992.4 994.0 993.7 992.9 993.6 985.9 987.4 984.7 982.6 990.1 992.4 993.6 1969 1000.4 993.3 986.2 989.2 989.5 989.9 986.3 987.2 986.6 983.6 985.8 992.5 1970 989.0 989.8 989.7 988.8 991.6 992.5 991.3 986.9 992.2 989.8 989.6 995.3 1971 995.3 991.3 986.8 991.2 997.5 989.3 993.4 990.6 986.6 983.1 986.8 994.5 1972 997.0 991.6 993.6 995.4 990.7 993.0 999.5 994.6 988.9 986.7 983.8 992.3 1973 995.1 990.3 981.5 983.8 993.1 996.0 984.0 988.7 986.6 987.9 984.3 986.5 1974 995.9 985.7 986.5 991.7 982.9 995.9 987.6 998.7 976.4 988.5 995.2 997.8 1975 995.6 990.1 986.4 982.3 989.8 988.3 993.9 984.8 982.4 980.8 985.1 991.7 1976 995.5 989.5 989.7 984.7 987.2 990.3 990.7 977.9 980.2 976.4 995.2 1005.7 1977 997.0 989.0 989.9 992.0 989.3 993.2 991.2 992.3 978.6 979.7 986.4 993.2 1978 989.1 986.0 988.6 987.9 992.0 990.1 993.9 978.5 981.3 985.1 989.0 988.8 1979 991.1 988.9 985.3 981.5 985.0 987.1 978.9 988.1 987.4 984.6 990.3 997.2 1980 991.2 994.3 989.5 991.3 988.8 987.2 992.8 990.4 993.5 984.5 989.2 993.8 1981 991.0 988.2 995.9 988.2 992.0 988.0 991.6 994.1 985.5 983.9 981.7 982.9 1982 992.0 989.4 983.1 979.8 984.9 990.4 987.0 983.3 977.3 987.0 988.9 999.6 1983 997.1 992.6 988.0 988.6 996.4 994.3 988.9 981.9 986.2 980.9 983.5 988.6 1984 994.6 993.8 984.6 987.7 991.0 989.5 990.1 990.7 987.9 984.6 985.6 1000.5 1985 996.9 991.0 986.9 990.8 991.4 991.5 972.6 988.9 979.0 985.1 981.9 983.0 1986 990.7 996.6 992.3 985.9 998.0 994.8 985.8 982.7 977.5 980.6 983.3 987.2 1987 997.8 991.8 987.2 989.0 993.9 993.0 990.2 980.7 986.5 984.3 978.0 990.1 1988 993.2 986.1 987.3 985.7 992.2 998.3 982.8 990.2 996.5 1001.0 986.0 987.2 1989 991.8 985.9 987.9 989.3 977.2 983.3 984.1 998.0 992.0 984.6 988.5 994.3 1990 993.5 987.5 988.9 995.6 1001.0 993.7 994.4 985.4 983.3 983.3 981.9 990.2 1991 986.3 993.0 987.3 992.9 987.7 987.6 990.7 984.2 990.9 984.9 987.5 999.6 1992 992.1 995.5 984.8 992.5 997.2 999.2 985.8 986.3 989.1 988.8 982.0 989.6 1993 1000.3 989.6 987.8 988.7 984.5 987.8 986.5 985.4 985.2 981.4 989.0 987.6 1994 990.2 986.6 985.4 987.8 992.4 1001.3 990.7 982.4 987.3 985.5 992.4 983.8 1995 989.3 986.2 986.4 989.7 984.6 991.4 998.9 988.4 984.1 987.3 985.7 982.6 1996 991.0 989.7 984.0 989.3 986.7 993.2 982.7 991.1 996.1 981.2 987.8 990.8 1997 992.4 994.1 980.9 991.7 984.7 994.4 986.6 987.5 985.7 987.8 994.2 993.9 1998 989.1 985.8 985.5 980.1 982.5 985.7 983.1 984.0 985.9 985.3 981.2 984.1 1999 989.1 990.8 991.6 981.6 986.6 999.1 986.6 980.5 986.9 976.0 986.8 981.0 2000 983.8 988.4 991.7 990.1 987.7 990.7 995.3 988.0 991.2 985.3 990.0 998.4 2001 991.0 992.9 988.4 983.2 994.0 986.4 989.3 980.6 983.3 975.1 980.9 981.8 2002 988.2 983.5 992.1 987.7 994.7 986.1 990.3 983.3 988.7 992.5 988.9 986.6 2003 997.2 991.7 990.3 983.5 985.7 996.6 988.9 980.6 987.8 987.6 - 995.1 2004 988.1 993.4 984.3 989.5 987.0 984.5 984.6 985.2 986.7 986.8 990.3 994.2 2005 990.4 983.2 988.3 983.3 990.9 994.6 989.2 985.9 990.1 987.5 990.2 999.7 2006 990.2 990.2 986.8 986.7 979.2 989.0 982.4 990.5 988.0 982.1 982.7 989.1 2007 990.8 988.2 989.0 995.2 993.1 998.7 999.3 987.4 993.5 985.2 987.4 982.1 2008 987.8 986.9 987.0 990.6 990.8 988.4 984.6 981.6 989.9 981.2 982.3 980.8 2009 985.4 - - - - - - - - - - -