year mth T 1949 1 21.8 1949 2 22.9 1949 3 21.3 1949 4 17.9 1949 5 16.3 1949 6 15.7 1949 7 15.0 1949 8 14.4 1949 9 16.1 1949 10 18.9 1949 11 19.9 1949 12 20.8 1950 1 23.8 1950 2 23.6 1950 3 22.3 1950 4 19.6 1950 5 19.4 1950 6 15.7 1950 7 14.3 1950 8 14.7 1950 9 17.0 1950 10 18.9 1950 11 20.8 1950 12 22.9 1951 1 23.0 1951 2 23.2 1951 3 23.0 1951 4 20.4 1951 5 16.4 1951 6 14.3 1951 7 14.1 1951 8 13.8 1951 9 16.1 1951 10 18.2 1951 11 19.6 1951 12 20.2 1952 1 21.0 1952 2 23.8 1952 3 21.4 1952 4 19.5 1952 5 16.8 1952 6 15.3 1952 7 13.1 1952 8 15.3 1952 9 16.5 1952 10 18.4 1952 11 19.4 1952 12 21.0 1953 1 21.9 1953 2 21.8 1953 3 21.9 1953 4 19.7 1953 5 17.1 1953 6 15.7 1953 7 14.1 1953 8 15.0 1953 9 16.3 1953 10 17.5 1953 11 20.5 1953 12 22.2 1954 1 23.8 1954 2 24.9 1954 3 22.3 1954 4 18.5 1954 5 17.8 1954 6 15.7 1954 7 14.6 1954 8 14.4 1954 9 15.5 1954 10 18.1 1954 11 21.2 1954 12 22.5 1955 1 23.5 1955 2 26.0 1955 3 23.1 1955 4 21.0 1955 5 18.6 1955 6 14.3 1955 7 13.8 1955 8 15.6 1955 9 16.2 1955 10 17.8 1955 11 19.8 1955 12 22.4 1956 1 24.2 1956 2 23.9 1956 3 22.1 1956 4 21.9 1956 5 17.6 1956 6 16.1 1956 7 14.1 1956 8 15.0 1956 9 16.8 1956 10 18.2 1956 11 20.1 1956 12 21.5 1957 1 23.4 1957 2 24.6 1957 3 22.9 1957 4 20.7 1957 5 17.7 1957 6 14.8 1957 7 13.3 1957 8 14.9 1957 9 16.5 1957 10 16.6 1957 11 19.4 1957 12 19.8 1958 1 22.6 1958 2 24.3 1958 3 23.0 1958 4 18.6 1958 5 16.9 1958 6 14.9 1958 7 13.4 1958 8 15.0 1958 9 15.8 1958 10 18.3 1958 11 20.6 1958 12 21.9 1959 1 23.2 1959 2 22.9 1959 3 22.3 1959 4 19.7 1959 5 15.2 1959 6 14.3 1959 7 13.7 1959 8 15.0 1959 9 16.9 1959 10 17.4 1959 11 19.4 1959 12 22.1 1960 1 22.9 1960 2 23.1 1960 3 20.8 1960 4 19.2 1960 5 17.5 1960 6 15.2 1960 7 14.0 1960 8 14.6 1960 9 16.2 1960 10 18.2 1960 11 19.4 1960 12 20.2 1961 1 22.0 1961 2 22.4 1961 3 21.4 1961 4 19.7 1961 5 17.2 1961 6 15.3 1961 7 13.9 1961 8 14.0 1961 9 16.0 1961 10 18.5 1961 11 19.8 1961 12 23.3 1962 1 25.2 1962 2 24.6 1962 3 22.1 1962 4 20.6 1962 5 18.6 1962 6 15.6 1962 7 14.9 1962 8 15.1 1962 9 16.0 1962 10 18.7 1962 11 19.5 1962 12 20.9 1963 1 23.0 1963 2 23.6 1963 3 21.9 1963 4 19.0 1963 5 16.7 1963 6 14.9 1963 7 14.6 1963 8 14.3 1963 9 16.4 1963 10 18.1 1963 11 18.7 1963 12 20.5 1964 1 21.6 1964 2 23.6 1964 3 21.5 1964 4 19.3 1964 5 16.2 1964 6 14.9 1964 7 14.9 1964 8 14.4 1964 9 15.3 1964 10 17.0 1964 11 18.9 1964 12 21.4 1965 1 23.2 1965 2 21.6 1965 3 20.8 1965 4 19.9 1965 5 16.4 1965 6 14.5 1965 7 12.9 1965 8 13.7 1965 9 15.9 1965 10 16.2 1965 11 18.5 1965 12 20.9 1966 1 22.2 1966 2 24.1 1966 3 22.7 1966 4 20.1 1966 5 16.1 1966 6 14.7 1966 7 13.8 1966 8 13.9 1966 9 15.5 1966 10 17.6 1966 11 18.6 1966 12 20.0 1967 1 21.7 1967 2 22.4 1967 3 22.0 1967 4 19.6 1967 5 17.1 1967 6 13.8 1967 7 14.1 1967 8 16.0 1967 9 16.0 1967 10 19.1 1967 11 19.4 1967 12 20.8 1968 1 22.5 1968 2 22.6 1968 3 24.1 1968 4 18.7 1968 5 17.0 1968 6 14.9 1968 7 13.5 1968 8 14.3 1968 9 15.2 1968 10 16.4 1968 11 17.8 1968 12 20.2 1969 1 21.7 1969 2 22.0 1969 3 21.0 1969 4 18.4 1969 5 16.5 1969 6 13.8 1969 7 12.6 1969 8 14.2 1969 9 16.3 1969 10 16.0 1969 11 20.1 1969 12 22.5 1970 1 24.5 1970 2 24.0 1970 3 22.9 1970 4 20.2 1970 5 16.9 1970 6 15.1 1970 7 15.1 1970 8 15.1 1970 9 16.4 1970 10 17.9 1970 11 20.3 1970 12 22.7 1971 1 24.3 1971 2 24.3 1971 3 22.3 1971 4 20.3 1971 5 18.1 1971 6 16.8 1971 7 14.3 1971 8 15.8 1971 9 16.3 1971 10 17.6 1971 11 20.0 1971 12 22.0 1972 1 22.3 1972 2 22.8 1972 3 22.7 1972 4 19.7 1972 5 16.9 1972 6 13.5 1972 7 14.5 1972 8 14.1 1972 9 16.4 1972 10 17.7 1972 11 21.3 1972 12 20.2 1973 1 23.2 1973 2 24.0 1973 3 22.8 1973 4 19.4 1973 5 17.6 1973 6 15.7 1973 7 13.9 1973 8 15.0 1973 9 16.6 1973 10 18.4 1973 11 20.4 1973 12 22.5 1974 1 23.8 1974 2 26.1 1974 3 22.1 1974 4 20.5 1974 5 18.0 1974 6 15.1 1974 7 15.3 1974 8 15.1 1974 9 16.7 1974 10 18.2 1974 11 20.7 1974 12 23.4 1975 1 24.6 1975 2 24.2 1975 3 23.2 1975 4 20.2 1975 5 18.4 1975 6 14.4 1975 7 13.9 1975 8 15.4 1975 9 16.1 1975 10 18.1 1975 11 19.1 1975 12 20.4 1976 1 22.4 1976 2 21.0 1976 3 22.7 1976 4 19.8 1976 5 16.5 1976 6 14.1 1976 7 14.0 1976 8 15.4 1976 9 15.7 1976 10 17.2 1976 11 18.2 1976 12 21.1 1977 1 22.3 1977 2 23.7 1977 3 23.0 1977 4 19.5 1977 5 15.5 1977 6 14.7 1977 7 14.3 1977 8 14.7 1977 9 13.9 1977 10 16.5 1977 11 18.1 1977 12 20.2 1978 1 23.7 1978 2 25.0 1978 3 22.9 1978 4 21.5 1978 5 17.4 1978 6 14.6 1978 7 14.5 1978 8 14.7 1978 9 16.1 1978 10 16.9 1978 11 20.0 1978 12 21.5 1979 1 24.1 1979 2 22.6 1979 3 22.8 1979 4 19.9 1979 5 17.0 1979 6 15.7 1979 7 14.3 1979 8 14.8 1979 9 16.1 1979 10 17.6 1979 11 20.2 1979 12 21.9 1980 1 NA 1980 2 22.7 1980 3 21.0 1980 4 19.2 1980 5 16.8 1980 6 14.8 1980 7 14.1 1980 8 14.4 1980 9 16.3 1980 10 18.1 1980 11 18.6 1980 12 21.0 1981 1 24.3 1981 2 23.6 1981 3 23.8 1981 4 21.5 1981 5 17.9 1981 6 16.2 1981 7 14.6 1981 8 14.5 1981 9 15.3 1981 10 17.3 1981 11 19.1 1981 12 22.5 1982 1 23.8 1982 2 24.2 1982 3 22.3 1982 4 18.9 1982 5 17.3 1982 6 14.1 1982 7 13.6 1982 8 14.7 1982 9 16.1 1982 10 16.6 1982 11 20.3 1982 12 20.9 1983 1 21.9 1983 2 22.1 1983 3 22.0 1983 4 19.5 1983 5 16.6 1983 6 14.6 1983 7 13.3 1983 8 14.9 1983 9 16.8 1983 10 17.7 1983 11 19.4 1983 12 NA 1984 1 21.5 1984 2 23.1 1984 3 22.4 1984 4 19.8 1984 5 16.8 1984 6 15.1 1984 7 15.1 1984 8 15.5 1984 9 16.4 1984 10 17.9 1984 11 20.9 1984 12 23.0 1985 1 23.9 1985 2 23.5 1985 3 22.3 1985 4 19.6 1985 5 16.9 1985 6 16.3 1985 7 15.1 1985 8 14.8 1985 9 16.6 1985 10 17.4 1985 11 19.6 1985 12 22.2 1986 1 24.2 1986 2 23.6 1986 3 22.8 1986 4 20.5 1986 5 17.9 1986 6 15.3 1986 7 13.9 1986 8 14.5 1986 9 15.9 1986 10 18.5 1986 11 20.0 1986 12 21.6 1987 1 23.7 1987 2 22.9 1987 3 21.4 1987 4 19.7 1987 5 17.3 1987 6 15.2 1987 7 14.4 1987 8 15.7 1987 9 16.0 1987 10 18.1 1987 11 19.9 1987 12 21.8 1988 1 23.0 1988 2 24.1 1988 3 21.6 1988 4 19.7 1988 5 17.7 1988 6 16.0 1988 7 15.0 1988 8 15.3 1988 9 17.2 1988 10 18.5 1988 11 19.9 1988 12 22.6 1989 1 23.4 1989 2 23.4 1989 3 23.1 1989 4 20.3 1989 5 17.4 1989 6 15.6 1989 7 14.5 1989 8 14.9 1989 9 17.5 1989 10 18.4 1989 11 19.9 1989 12 21.5 1990 1 22.9 1990 2 25.5 1990 3 23.4 1990 4 21.1 1990 5 18.0 1990 6 15.3 1990 7 14.9 1990 8 15.3 1990 9 16.0 1990 10 18.6 1990 11 19.9 1990 12 21.8 1991 1 22.9 1991 2 23.9 1991 3 22.1 1991 4 19.1 1991 5 16.9 1991 6 14.7 1991 7 14.3 1991 8 15.3 1991 9 16.4 1991 10 17.3 1991 11 18.0 1991 12 21.1 1992 1 23.1 1992 2 23.2 1992 3 20.6 1992 4 17.8 1992 5 15.8 1992 6 14.4 1992 7 14.6 1992 8 14.0 1992 9 15.2 1992 10 16.7 1992 11 19.8 1992 12 21.0 1993 1 22.5 1993 2 22.5 1993 3 21.3 1993 4 19.3 1993 5 17.4 1993 6 15.6 1993 7 13.9 1993 8 14.1 1993 9 14.8 1993 10 18.0 1993 11 18.3 1993 12 20.7 1994 1 24.0 1994 2 24.2 1994 3 21.9 1994 4 19.9 1994 5 18.2 1994 6 15.1 1994 7 14.4 1994 8 14.9 1994 9 15.7 1994 10 16.6 1994 11 19.1 1994 12 22.0 1995 1 23.1 1995 2 24.3 1995 3 22.7 1995 4 21.7 1995 5 18.2 1995 6 15.1 1995 7 14.0 1995 8 14.6 1995 9 16.6 1995 10 17.0 1995 11 19.3 1995 12 22.2 1996 1 24.0 1996 2 24.1 1996 3 21.9 1996 4 20.8 1996 5 17.3 1996 6 NA 1996 7 14.5 1996 8 14.9 1996 9 17.6 1996 10 18.6 1996 11 19.3 1996 12 21.0 1997 1 22.2 1997 2 24.0 1997 3 22.0 1997 4 19.7 1997 5 18.3 1997 6 14.8 1997 7 14.7 1997 8 14.7 1997 9 15.9 1997 10 17.8 1997 11 19.5 1997 12 22.3 1998 1 23.8 1998 2 26.2 1998 3 23.8 1998 4 21.2 1998 5 18.6 1998 6 16.6 1998 7 16.3 1998 8 15.7 1998 9 17.4 1998 10 19.0 1998 11 20.6 1998 12 22.3 1999 1 NA 1999 2 23.7 1999 3 23.1 1999 4 20.8 1999 5 18.7 1999 6 16.3 1999 7 15.5 1999 8 15.5 1999 9 17.1 1999 10 18.8 1999 11 20.1 1999 12 20.9 2000 1 22.8 2000 2 23.4 2000 3 22.8 2000 4 20.2 2000 5 18.4 2000 6 16.0 2000 7 16.3 2000 8 16.0 2000 9 16.7 2000 10 18.0 2000 11 18.1 2000 12 22.3