Campbell 18Z temperature 1961 - - - 7.0 5.6 5.2 4.0 5.4 4.6 6.9 6.7 8.0 1962 8.5 8.8 8.6 7.1 7.3 6.5 5.9 5.8 6.1 5.7 7.6 8.8 1963 8.5 9.3 7.6 7.0 5.4 4.8 4.5 4.3 4.7 5.8 5.4 6.5 1964 7.8 8.1 7.3 6.6 5.6 4.9 5.1 4.1 5.7 5.8 6.1 8.6 1965 8.7 7.3 8.9 6.7 6.3 5.3 4.7 5.1 5.5 5.1 6.1 7.0 1966 7.6 8.3 8.0 7.2 6.4 5.2 5.0 5.6 5.4 5.4 6.7 7.1 1967 8.6 7.9 8.7 6.4 5.1 5.9 4.8 5.6 4.4 6.3 5.3 7.4 1968 7.9 8.5 8.1 8.1 7.4 5.5 5.5 6.1 4.9 5.5 6.9 8.2 1969 9.2 8.6 7.2 6.5 5.8 4.4 6.3 6.1 6.2 4.7 7.0 8.6 1970 7.6 8.3 7.9 6.8 6.2 5.9 5.5 5.8 - - 6.9 7.0 1971 8.5 9.1 8.4 8.3 6.8 5.4 5.9 5.4 4.5 6.0 6.6 8.4 1972 8.2 8.5 8.1 6.2 5.5 3.6 4.2 4.5 4.8 5.2 6.1 7.0 1973 8.5 8.4 8.6 6.6 4.2 5.7 5.9 4.9 5.5 5.2 5.8 8.1 1974 8.0 8.5 8.1 7.6 6.0 4.3 3.7 4.7 6.1 5.3 7.0 9.2 1975 9.9 9.0 9.2 7.7 5.8 4.9 4.8 4.4 5.5 5.3 6.1 6.5 1976 7.8 7.7 8.2 7.1 6.2 4.3 4.2 4.4 5.1 5.2 6.1 9.0 1977 8.2 8.5 8.5 6.6 5.4 4.6 4.6 6.0 4.6 5.4 6.8 8.5 1978 9.1 9.0 7.9 8.1 6.6 4.7 5.6 6.3 5.9 5.8 6.9 7.9 1979 8.4 8.0 8.0 8.3 6.1 6.3 6.2 4.8 5.4 6.0 7.0 8.4 1980 8.6 9.3 9.1 8.1 6.5 5.7 4.6 5.7 5.6 5.9 5.1 7.5 1981 8.1 - 8.4 8.3 6.5 6.5 6.0 - - - - - 1982 - - - 8.0 7.3 6.3 5.3 5.6 6.1 5.0 - - 1983 - - - 6.8 5.3 5.1 5.6 5.8 4.1 5.6 - - 1984 - - 9.3 7.1 6.2 6.1 4.9 4.9 6.3 - - - 1985 - - 8.6 7.9 6.7 7.1 5.6 6.0 5.9 - - - 1986 - - 9.1 8.2 5.8 5.8 4.6 4.4 4.5 - - - 1987 - - 8.6 7.2 6.8 4.8 5.1 5.8 4.4 - - - 1988 - - - 7.0 4.2 4.6 4.9 4.8 5.2 5.7 - - 1989 - - - 7.3 6.9 5.8 4.9 6.1 6.5 - - - 1990 - - - - - - - - - - - - 1991 - - - - - - - - - - - - 1992 - - - 7.1 - 4.4 4.8 - 4.4 - - - 1993 - - - 7.4 6.9 5.2 6.2 5.5 4.9 - - - 1994 - - - 7.1 6.3 4.2 4.8 5.3 3.3 - - - 1995 8.1 8.1 7.6 8.2 7.0 2.7 2.6 4.6 5.2 4.6 5.9 7.6 1996 8.3 8.5 - 7.4 6.3 4.4 4.4 4.5 6.6 5.7 5.6 8.3 1997 8.5 8.5 7.7 6.4 6.4 5.4 6.0 5.1 4.2 5.0 5.1 6.6 1998 7.7 - 7.4 7.0 6.0 5.5 4.7 4.4 5.4 4.8 6.3 8.1 1999 8.6 10.1 8.2 7.2 7.1 - - - - - - - 2000 - - - - - - - - - - - - 2001 - - - - - - - - - - - - 2002 - - - - - - - - - - - - 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - - - 2007 - - - - - - 3.2 4.9 5.6 4.6 5.9 8.1 2008 9.0 9.0 8.2 7.3 6.3 5.4 4.9 4.5 5.8 4.8 5.4 7.1 2009 8.7 - - - - - - - - - - -