YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC D-J-F M-A-M J-J-A S-O-N metANN 1961 20.4 21.6 20.4 16.1 16.0 13.3 12.4 12.4 14.6 14.9 17.2 18.3 20.4 17.5 12.7 15.6 16.55 1962 20.2 19.6 18.6 18.1 15.6 14.3 12.2 13.4 13.2 13.7 17.2 18.7 19.4 17.4 13.3 14.7 16.20 1963 19.3 19.7 20.0 17.2 15.6 12.8 11.8 12.7 13.8 16.4 17.2 19.8 19.2 17.6 12.4 15.8 16.27 1964 19.3 19.3 19.2 16.2 14.6 14.1 12.1 12.0 12.8 13.0 15.7 17.1 19.5 16.7 12.7 13.8 15.68 1965 20.5 19.5 19.3 18.2 13.4 11.7 11.0 11.0 12.7 14.4 15.0 18.6 19.0 17.0 11.2 14.0 15.32 1966 19.7 19.2 19.1 15.8 13.8 11.6 11.0 11.0 11.8 13.2 16.3 17.7 19.2 16.2 11.2 13.8 15.09 1967 19.2 19.5 18.0 16.9 14.0 13.3 10.8 11.0 13.0 15.2 16.6 18.6 18.8 16.3 11.7 14.9 15.43 1968 19.7 19.1 16.4 15.1 12.3 11.9 11.3 10.6 11.6 13.7 15.0 17.8 19.1 14.6 11.3 13.4 14.61 1969 19.7 19.6 19.2 16.3 14.0 12.7 12.0 11.5 11.1 14.8 16.3 18.0 19.0 16.5 12.1 14.1 15.42 1970 19.3 20.1 19.4 15.7 14.1 12.3 12.4 11.2 12.2 13.2 15.3 17.7 19.1 16.4 12.0 13.6 15.27 1971 19.4 19.7 18.5 16.3 13.8 12.7 11.7 11.0 12.0 12.8 13.6 16.2 18.9 16.2 11.8 12.8 14.93 1972 19.3 20.6 18.7 16.9 15.9 12.6 11.6 11.5 12.3 13.9 17.0 19.2 18.7 17.2 11.9 14.4 15.54 1973 19.9 19.2 18.7 16.5 14.2 10.5 11.9 11.4 12.0 13.5 15.1 17.1 19.4 16.5 11.3 13.5 15.18 1974 20.6 19.7 18.6 16.2 14.1 12.6 11.5 11.8 13.0 13.8 15.3 18.0 19.1 16.3 12.0 14.0 15.36 1975 18.7 21.3 17.7 15.8 14.7 12.0 11.9 11.3 12.1 14.1 16.0 18.8 19.3 16.1 11.7 14.1 15.30 1976 19.2 20.5 19.3 17.4 14.8 12.4 12.8 12.3 13.3 14.5 14.6 17.8 19.5 17.2 12.5 14.1 15.83 1977 19.1 20.4 17.4 16.5 13.8 12.4 11.9 12.5 12.3 14.4 16.3 19.1 19.1 15.9 12.3 14.3 15.40 1978 19.7 20.3 20.6 18.1 14.5 12.3 11.5 12.8 12.3 13.8 16.5 18.8 19.7 17.7 12.2 14.2 15.96 1979 19.2 19.9 18.8 16.4 12.9 12.5 11.9 11.1 12.2 14.1 15.9 18.6 19.3 16.0 11.8 14.1 15.31 1980 19.4 18.8 19.3 15.8 14.6 12.2 11.7 12.5 12.6 11.8 16.0 17.4 18.9 16.6 12.1 13.5 15.28 1981 19.8 18.0 18.0 17.6 13.6 10.9 11.6 11.1 13.6 14.1 15.1 16.9 18.4 16.4 11.2 14.3 15.07 1982 18.9 18.6 17.5 15.4 13.8 11.7 11.3 12.5 12.9 14.9 17.5 18.9 18.1 15.6 11.8 15.1 15.16 1983 20.2 20.1 19.9 17.4 15.9 13.5 11.8 13.1 14.0 14.3 15.4 18.3 19.7 17.7 12.8 14.6 16.21 1984 19.9 19.9 18.3 17.6 14.6 12.6 11.6 11.7 12.5 15.2 16.2 16.9 19.4 16.8 12.0 14.6 15.70 1985 18.6 21.7 19.3 16.4 14.1 14.1 11.9 12.3 12.8 13.3 15.8 16.3 19.1 16.6 12.8 14.0 15.60 1986 19.7 18.2 18.1 15.9 14.7 12.2 10.7 11.0 12.9 12.6 15.3 16.3 18.1 16.2 11.3 13.6 14.80 1987 18.1 18.9 19.6 17.2 13.9 13.1 11.1 11.9 13.2 13.7 15.0 18.0 17.8 16.9 12.0 14.0 15.17 1988 18.4 20.4 20.4 17.7 15.1 12.8 11.2 12.1 13.5 14.8 14.9 17.3 18.9 17.7 12.0 14.4 15.78 1989 19.9 19.5 19.0 16.9 14.7 12.5 11.5 11.7 13.4 13.3 16.9 18.1 18.9 16.9 11.9 14.5 15.55 1990 18.2 20.1 19.2 16.5 14.5 11.5 10.9 11.0 13.1 13.7 15.4 17.4 18.8 16.7 11.1 14.1 15.18 1991 19.0 19.4 18.7 18.3 15.3 13.1 12.2 11.9 13.2 15.1 15.0 18.5 18.6 17.4 12.4 14.4 15.72 1992 19.5 20.2 18.9 16.9 13.9 12.7 12.6 11.3 11.3 13.7 14.4 16.9 19.4 16.6 12.2 13.1 15.33 1993 18.4 18.5 17.7 15.7 13.5 11.6 11.5 11.6 12.2 12.5 15.2 17.9 17.9 15.6 11.6 13.3 14.61 1994 18.9 18.9 19.7 17.9 15.0 999.9 12.4 12.0 13.0 13.7 15.5 17.5 18.6 17.5 12.4 14.1 15.65 1995 18.7 18.9 17.7 15.3 13.3 11.8 11.4 12.4 12.3 13.7 14.5 16.4 18.4 15.4 11.9 13.5 14.79 1996 17.6 19.5 17.0 16.0 13.8 11.8 11.6 11.3 12.0 13.5 15.7 15.8 17.8 15.6 11.6 13.7 14.68 1997 19.3 18.7 17.5 16.7 13.8 12.5 10.3 11.2 12.6 13.7 15.6 17.4 17.9 16.0 11.3 14.0 14.81 1998 18.9 18.2 18.3 15.7 14.3 11.4 10.1 12.6 11.9 12.7 15.2 17.3 18.2 16.1 11.4 13.3 14.72 1999 18.0 18.6 18.0 17.5 14.8 12.2 11.8 11.6 12.4 12.8 15.5 18.0 18.0 16.8 11.9 13.6 15.04 2000 19.2 19.3 17.3 15.9 13.4 12.3 11.4 11.0 12.9 13.4 16.3 17.7 18.8 15.5 11.6 14.2 15.03 2001 18.7 18.3 17.3 17.5 14.6 12.5 11.2 11.6 12.5 12.4 14.9 15.3 18.2 16.5 11.8 13.3 14.93 2002 17.0 17.9 17.7 16.2 14.9 12.6 11.4 11.2 12.3 13.6 15.1 17.6 16.7 16.3 11.7 13.7 14.60 2003 18.1 19.3 18.8 17.0 15.0 11.8 11.5 11.1 11.8 13.2 15.6 16.6 18.3 16.9 11.5 13.5 15.07 2004 17.5 19.0 17.1 16.5 13.5 12.9 10.6 10.7 12.0 13.9 15.5 17.8 17.7 15.7 11.4 13.8 14.65 2005 18.1 17.9 19.4 15.1 15.8 11.8 11.2 11.5 11.7 12.5 14.2 15.5 17.9 16.8 11.5 12.8 14.75 2006 16.9 18.0 17.7 14.3 13.3 11.2 10.8 12.9 13.1 14.1 16.8 17.7 16.8 15.1 11.6 14.7 14.55 2007 18.2 19.1 18.1 15.9 13.9 12.1 12.2 12.3 12.6 13.1 15.4 16.3 18.3 16.0 12.2 13.7 15.05 2008 18.9 20.6 18.7 16.3 15.0 12.2 11.0 999.9 12.8 999.9 14.9 17.0 18.6 16.7 11.5 13.7 15.13 2009 19.8 999.9 18.1 16.7 14.2 12.2 11.8 12.1 11.7 14.7 999.9 999.9 18.8 16.3 12.0 14.0 15.29