Year Month Max Min 1951 1 6.1 -8.3 1951 2 5 -6.7 1951 3 7.8 -7.2 1951 4 7.2 -5.6 1951 5 2.8 -11.7 1951 6 0.6 -20.6 1951 7 3.9 -24.4 1951 8 3.9 -36.1 1951 9 1.1 -28.9 1951 10 5 -27.8 1951 11 3.9 -8.9 1951 12 5 -5.6 1952 1 7.8 -5 1952 2 6.1 -3.3 1952 3 5.6 -9.4 1952 4 2.8 -12.2 1952 5 1.1 -29.4 1952 6 2.2 -29.4 1952 7 1.7 -29.4 1952 8 7.2 -25.6 1952 9 4.4 -25.6 1952 10 5 -25 1952 11 4.4 -22.2 1952 12 5 -10.6 1953 1 4.4 -6.1 1953 2 4.4 -12.2 1953 3 5 -16.1 1953 4 1.7 -26.7 1953 5 2.2 -34.4 1953 6 0 -31.7 1953 7 2.8 -38.3 1953 8 2.8 -26.1 1953 9 5 -25 1953 10 2.2 -28.9 1953 11 4.4 -16.1 1953 12 10 -6.7 1954 1 3.9 -6.1 1954 2 6.7 -6.7 1954 3 6.7 -8.9 1954 4 2.8 -18.3 1954 5 5.6 -21.7 1954 6 1.1 -29.4 1954 7 4.4 -31.7 1954 8 3.3 -34.4 1954 9 5 -33.9 1954 10 5 -18.9 1954 11 6.7 -11.1 1954 12 5.6 -5.6 1955 1 10 -7.2 1955 2 6.7 -4.4 1955 3 5.6 -9.4 1955 4 5 -8.9 1955 5 4.4 -12.8 1955 6 2.8 -17.2 1955 7 1.7 -20.6 1955 8 5 -23.3 1955 9 4.4 -23.3 1955 10 3.3 -13.9 1955 11 3.9 -16.7 1955 12 5 -5.6 1956 1 5 -2.8 1956 2 6.7 -3.9 1956 3 7.8 -4.4 1956 4 6.7 -7.2 1956 5 6.7 -7.2 1956 6 3.9 -12.8 1956 7 3.3 -16.1 1956 8 5 -13.3 1956 9 2.8 -18.3 1956 10 6.1 -11.1 1956 11 5.6 -8.9 1956 12 5.6 -6.7 1957 1 5 -1.1 1957 2 8.3 -4.4 1957 3 6.1 -5.6 1957 4 2.8 -7.8 1957 5 2.2 -12.2 1957 6 -1.1 -24.4 1957 7 1.1 -33.9 1957 8 2.8 -28.9 1957 9 3.3 -21.7 1957 10 1.1 -20.6 1957 11 5.6 -12.2 1957 12 4.4 -7.8 1958 1 7.8 -3.9 1958 2 5 -5 1958 3 2.8 -10.6 1958 4 6.7 -11.7 1958 5 0.6 -26.1 1958 6 3.3 -34.4 1958 7 1.7 -40 1958 8 0.6 -43.3 1958 9 1.7 -32.2 1958 10 3.9 -23.9 1958 11 5 -7.2 1958 12 3.3 -8.3 1959 1 5 -10.6 1959 2 3.3 -9.4 1959 3 7.2 -12.2 1959 4 -0.6 -34.4 1959 5 1.7 -32.2 1959 6 5 -31.7 1959 7 0 -40.6 1959 8 3.9 -36.1 1959 9 3.9 -37.8 1959 10 3.9 -22.8 1959 11 4.4 -20 1959 12 6.7 -11.7 1960 1 5 -6.1 1960 2 11.7 -7.8 1960 3 5.6 -13.9 1960 4 4.4 -16.1 1960 5 3.9 -18.3 1960 6 6.1 -33.3 1960 7 2.9 -37.2 1960 8 1.7 -28.9 1960 9 5 -25 1960 10 3.3 -18.3 1960 11 4.4 -18.3 1960 12 4.4 -7.8 1961 1 7.8 -1.7 1961 2 6.7 -3.9 1961 3 6.1 -5 1961 4 5 -7.2 1961 5 3.3 -9.4 1961 6 3.9 -19.4 1961 7 1.7 -26.7 1961 8 1.7 -28.9 1961 9 3.3 -25 1961 10 3.9 -27.2 1961 11 5 -19.4 1961 12 6.7 -8.9 1962 1 4.7 -4.5 1962 2 4.1 -7.2 1962 3 6.6 -8.1 1962 4 5.6 -8.2 1962 5 4 -11.2 1962 6 4.4 -20.9 1962 7 2.3 -22.9 1962 8 5.1 -29.6 1962 9 5.4 -32.5 1962 10 5.5 -19.2 1962 11 4.1 -20.7 1962 12 5.1 -6.4 1963 1 6.2 -4.6 1963 2 6 -6.3 1963 3 8.6 -7.8 1963 4 5.2 -11.3 1963 5 4.6 -12.6 1963 6 1.8 -17.4 1963 7 5.2 -24.3 1963 8 0.7 -35.4 1963 9 2.7 -31.3 1963 10 0.6 -30.2 1963 11 3.5 -18.6 1963 12 6.2 -6 1964 1 5.9 -4.8 1964 2 6.4 -7.6 1964 3 7.2 -11.7 1964 4 4.4 -15.4 1964 5 3.1 -17.9 1964 6 -0.3 -25.2 1964 7 3.1 -17.5 1964 8 -1.8 -33.5 1964 9 3.8 -29 1964 10 2.9 -15.4 1964 11 4.7 -16 1964 12 5.8 -10.1 1965 1 7.5 -6.1 1965 2 6.5 -3.8 1965 3 8.3 -5.1 1965 4 3.7 -11 1965 5 6.4 -10.6 1965 6 4.2 -18.8 1965 7 5.6 -35.3 1965 8 2.9 -30.3 1965 9 4.4 -24 1965 10 4.2 -28.1 1965 11 6.2 -18.6 1965 12 5.9 -7.3 1966 1 7.7 -4.4 1966 2 4.3 -4.3 1966 3 6.7 -6.1 1966 4 6.9 -11.1 1966 5 3.4 -14.1 1966 6 3.1 -19 1966 7 3.6 -36.6 1966 8 3.8 -28.5 1966 9 3.4 -26.7 1966 10 2.7 -24.8 1966 11 7.9 -14.8 1966 12 4.3 -9.2 1967 1 7.3 -5.7 1967 2 5.5 -7.1 1967 3 6.7 -4.9 1967 4 4.7 -7.1 1967 5 3.2 -17 1967 6 3.5 -26.4 1967 7 0.5 -19.2 1967 8 1.6 -27 1967 9 3.9 -27.2 1967 10 3.1 -21.6 1967 11 6 -12.3 1967 12 6.7 -6.3 1968 1 5.4 -2.9 1968 2 5.8 -5 1968 3 5.8 -6.2 1968 4 5.9 -6.2 1968 5 4.4 -9.7 1968 6 2.8 -21.3 1968 7 3.4 -17.3 1968 8 4.5 -29.2 1968 9 3.4 -31.8 1968 10 7.9 -21.5 1968 11 6 -21.8 1968 12 5.8 -6.5 1969 1 4.1 -5.1 1969 2 5.8 -4 1969 3 4.9 -14.3 1969 4 4.8 -11.8 1969 5 3.3 -14.8 1969 6 1.8 -24.1 1969 7 0.8 -24.5 1969 8 1.4 -23.4 1969 9 5.1 -22.9 1969 10 1.1 -18.9 1969 11 3.4 -11.7 1969 12 7 -5.6 1970 1 5.3 -6 1970 2 7.2 -4.9 1970 3 4.8 -6.7 1970 4 5.8 -11 1970 5 3.7 -12.4 1970 6 5.5 -16.2 1970 7 5.6 -18.3 1970 8 3.8 -26.1 1970 9 4.6 -17.4 1970 10 2.3 -18.8 1970 11 4.7 -8.3 1970 12 6.2 -3.9 1971 1 6.1 -2.5 1971 2 5.6 -3.3 1971 3 5.8 -5.4 1971 4 5.5 -5.7 1971 5 0.8 -10.6 1971 6 4 -10.6 1971 7 2.5 -12.8 1971 8 2.3 -13.7 1971 9 3.8 -17.7 1971 10 4.2 -11.4 1971 11 5.2 -10.9 1971 12 5.2 -3.8 1972 1 8.7 -1.7 1972 2 8.4 -1.6 1972 3 6.5 -3.8 1972 4 5.8 -6 1972 5 5.5 -9 1972 6 0.7 -13.2 1972 7 4.5 -11 1972 8 3.4 -21.6 1972 9 3.6 -12.3 1972 10 4.4 -15.5 1972 11 4.2 -7.8 1972 12 5.6 -5.8 1973 1 4.1 -4.8 1973 2 4.7 -3.2 1973 3 4.9 -6.2 1973 4 4.8 -10 1973 5 2.8 -10.4 1973 6 3.6 -13.9 1973 7 4.9 -24.8 1973 8 5 -23.6 1973 9 2.4 -24.9 1973 10 2.8 -16.4 1973 11 4.4 -7.9 1973 12 6 -7.9 1974 1 7.9 -2.2 1974 2 9.4 -1 1974 3 8.1 -2.8 1974 4 3.7 -5.7 1974 5 6.7 -10.1 1974 6 3.9 -9.5 1974 7 2.1 -13.4 1974 8 3.5 -13.4 1974 9 2.5 -20.8 1974 10 3.8 -13.8 1974 11 6.4 -15.2 1974 12 7.7 -4.6 1975 1 7 -3.1 1975 2 8.7 -2.8 1975 3 4.7 -4.7 1975 4 4.8 -7.2 1975 5 4.1 -10.5 1975 6 0 -14.5 1975 7 0 -18.5 1975 8 2.4 -16.8 1975 9 3.4 -14.5 1975 10 7.1 -17.4 1975 11 3.3 -16.7 1975 12 7.1 -5.5 1976 1 4.8 -3.9 1976 2 6.2 -4.1 1976 3 6 -5.8 1976 4 6.7 -5.5 1976 5 7.6 -20.9 1976 6 0.8 -26.6 1976 7 2.4 -29.5 1976 8 0.1 -36.5 1976 9 2.5 -28 1976 10 5.5 -30.2 1976 11 7.2 -15.8 1976 12 6.9 -5.9 1977 1 10 -1.5 1977 2 6 -4.6 1977 3 6.2 -4.8 1977 4 7.6 -6.1 1977 5 3.3 -13.7 1977 6 7.4 -16.5 1977 7 -0.3 -30.4 1977 8 2.7 -40.4 1977 9 2.9 -28.5 1977 10 3.4 -27.9 1977 11 8.1 -13.9 1977 12 6.5 -7 1978 1 3.4 -5.8 1978 2 7 -5.9 1978 3 6.6 -8.8 1978 4 4.7 -12 1978 5 5.3 -18.3 1978 6 6.9 -16.9 1978 7 -1.6 -33.3 1978 8 4.5 -35 1978 9 3.5 -35.1 1978 10 4.7 -24.8 1978 11 4.1 -17.9 1978 12 6.2 -6.6 1979 1 10.4 -7.9 1979 2 7.4 -5.8 1979 3 5.6 -5.1 1979 4 4.3 -9.9 1979 5 3.2 -19.7 1979 6 4.2 -24.3 1979 7 2.7 -29.1 1979 8 2.4 -32 1979 9 3.8 -27.3 1979 10 2.2 -22 1979 11 6.2 -15.6 1979 12 5.8 -8.3 1980 1 5.4 -7 1980 2 10.6 -2.4 1980 3 5.6 -7.2 1980 4 2 -14.9 1980 5 5 -16.5 1980 6 3.4 -23.9 1980 7 4.6 -26.3 1980 8 3.5 -37.3 1980 9 3.5 -21.5 1980 10 3.1 -22.6 1980 11 3.5 -15.5 1980 12 4.9 -5.3 1981 1 6.2 -2.8 1981 2 8.8 -5.4 1981 3 9.5 -5.7 1981 4 4.7 -8 1981 5 9.4 -15.3 1981 6 2.5 -20.6 1981 7 3.1 -22.6 1981 8 2 -25.3 1981 9 1.5 -27.6 1981 10 4.7 -27.2 1981 11 4.5 -19.3 1981 12 4 -6.2 1982 1 8.9 -5.2 1982 2 6 -3 1982 3 8.6 -3.7 1982 4 5.3 -8.5 1982 5 6.8 -7.9 1982 6 6.6 -14.5 1982 7 0.8 -26.5 1982 8 3.8 -21.2 1982 9 3.2 -29.4 1982 10 4.8 -26.8 1982 11 3.6 -15.7 1982 12 8.1 -4.9 1983 1 5.7 -1.5 1983 2 6.6 -4.1 1983 3 6.8 -4.2 1983 4 6.5 -6.7 1983 5 5.7 -8.9 1983 6 4.3 -8.6 1983 7 2.5 -11 1983 8 2.8 -13 1983 9 2.3 -18.3 1983 10 3.2 -15.2 1983 11 5.1 -14.2 1983 12 7 -4 1984 1 5.5 -3.4 1984 2 7.8 -2.7 1984 3 6.9 -3.8 1984 4 7.9 -7.9 1984 5 1.4 -10 1984 6 0 -15.2 1984 7 2.7 -19.7 1984 8 3.1 -19.3 1984 9 5.6 -15.3 1984 10 2.9 -18 1984 11 4.8 -8.4 1984 12 7.1 -5.9 1985 1 11.8 -1.3 1985 2 8.5 -2.1 1985 3 5.6 -4.5 1985 4 7.7 -5.6 1985 5 5.6 -8.5 1985 6 5.3 -11.1 1985 7 4.5 -17.5 1985 8 5.1 -20.1 1985 9 4.8 -18.3 1985 10 6.1 -17.3 1985 11 4.3 -5 1985 12 5.3 -5.5 1986 1 7 -2.8 1986 2 5.8 -0.9 1986 3 6.3 -4.1 1986 4 5.1 -5.5 1986 5 -0.2 -13.4 1986 6 3.6 -12.5 1986 7 2.7 -19.7 1986 8 3.8 -27.1 1986 9 4 -32.7 1986 10 3.8 -30.1 1986 11 5.5 -14.6 1986 12 5.9 -9 1987 1 7.1 -3.2 1987 2 6.8 -6.8 1987 3 4.9 -6.6 1987 4 4.5 -8.9 1987 5 3.7 -10.1 1987 6 2.7 -21.7 1987 7 -2.1 -33.2 1987 8 3.3 -34 1987 9 3.7 -39.6 1987 10 4.6 -31.8 1987 11 4.9 -11.7 1987 12 9 -5.5 1988 1 6.3 -2.9 1988 2 9.7 -4.4 1988 3 8.2 -4.3 1988 4 3.7 -7.4 1988 5 3.5 -11.3 1988 6 3.9 -11 1988 7 3.1 -15 1988 8 1.8 -18.6 1988 9 4.9 -20.5 1988 10 5.9 -14.2 1988 11 5.5 -7.4 1988 12 11.4 -4.7 1989 1 6.9 -1.1 1989 2 6.7 -1.1 1989 3 9.5 -1.9 1989 4 2.3 -5.9 1989 5 3.9 -6.3 1989 6 3.4 -9 1989 7 4.2 -9.9 1989 8 5.1 -11.1 1989 9 3.5 -11.2 1989 10 3.9 -6.6 1989 11 6.5 -5.4 1989 12 5.9 -3.6 1990 1 7.8 -0.5 1990 2 6.6 -1.2 1990 3 6.7 -2.6 1990 4 2.7 -11.4 1990 5 3.9 -7.9 1990 6 3.3 -11.5 1990 7 3.3 -10.3 1990 8 3.5 -19.5 1990 9 3.1 -18.6 1990 10 3.3 -14.6 1990 11 3.3 -9.6 1990 12 4.3 -5.5 1991 1 6 -2.6 1991 2 7.7 -2.7 1991 3 4.4 -6.3 1991 4 5.9 -7.2 1991 5 2.6 -10.9 1991 6 0.1 -15.2 1991 7 3.9 -15.1 1991 8 3.3 -17.6 1991 9 5.4 -20.1 1991 10 3.6 -21.3 1991 11 4.5 -10.6 1991 12 6.3 -4.8 1992 1 6.7 -2.4 1992 2 5.8 -4 1992 3 7.2 -6.8 1992 4 7.8 -7.8 1992 5 1.2 -16.5 1992 6 -0.8 -21.8 1992 7 1.5 -25.9 1992 8 4.9 -28.4 1992 9 2 -22.7 1992 10 3.3 -16.8 1992 11 3.7 -12.7 1992 12 7.3 -1.5 1993 1 6.3 -2.8 1993 2 6.2 -3.9 1993 3 6.8 -8 1993 4 4.3 -8.9 1993 5 3.9 -10.6 1993 6 1.4 -16.5 1993 7 3.7 -17.2 1993 8 3.9 -18.7 1993 9 2.3 -17.6 1993 10 1.6 -17.4 1993 11 4.7 -8.6 1993 12 5 -5.5 1994 1 5.8 -2.7 1994 2 4.6 -2 1994 3 6.4 -4.7 1994 4 4.1 -6.1 1994 5 5.4 -7.6 1994 6 3.4 -10.9 1994 7 -0.2 -29.3 1994 8 2.8 -25.5 1994 9 4 -23.4 1994 10 -0.4 -19.4 1994 11 5.4 -7.8 1994 12 5.9 -3.7 1995 1 6.6 -2.2 1995 2 8.3 -2.8 1995 3 7 -5.7 1995 4 4.3 -6.3 1995 5 4.8 -11 1995 6 3.3 -17.2 1995 7 0.1 -17.8 1995 8 -0.7 -27.1 1995 9 2.6 -21.5 1995 10 4.5 -15.8 1995 11 3.7 -12.6 1995 12 4.3 -6.3 1996 1 6 -2.9 1996 2 7.7 -3.8 1996 3 6.1 -7.1 1996 4 4 -7.7 1996 5 6 -8.6 1996 6 4.4 -13.1 1996 7 3.5 -21.5 1996 8 5.3 -23.9 1996 9 3.5 -16.8 1996 10 3.4 -16.5 1996 11 4.9 -15 1996 12 7.2 -6.6 1997 1 8.4 -1.9 1997 2 4.8 -2.5 1997 3 6.5 -6.1 1997 4 5.6 -8.3 1997 5 5.6 -8.2 1997 6 7.8 -12.9 1997 7 1.9 -17.7 1997 8 3.7 -23 1997 9 0.2 -17.5 1997 10 4.4 -11.3 1997 11 4.5 -9.7 1997 12 5 -3.4 1998 1 8.2 -1.9 1998 2 7 -2.2 1998 3 7.1 -2.7 1998 4 4.8 -9.8 1998 5 4.0 -14.0 1998 6 4.7 -7 1998 7 1.8 -7.9 1998 8 1.5 -9.4 1998 9 4.6 -19.1 1998 10 3.3 -13.3 1998 11 3.5 -10.8 1998 12 4.1 -5.8 1999 1 8.3 -2.2 1999 2 7.1 -2 1999 3 5.9 -3.6 1999 4 4.6 -4.9 1999 5 4.2 -6.2 1999 6 1.6 -11.6 1999 7 3.8 -14 1999 8 -0.5 -23.3 1999 9 2.6 -28.2 1999 10 2.7 -12.3 1999 11 4.6 -7.4 1999 12 4 -7.2 2000 1 3.9 -3.6 2000 2 5.6 -3.7 2000 3 5.7 -6.3 2000 4 2.5 -7.1 2000 5 3.5 -7.6 2000 6 6 -8.5 2000 7 5.1 -10.9 2000 8 2.5 -15 2000 9 2.1 -17.2 2000 10 4.4 -8.6 2000 11 3.7 -8.2 2000 12 7.1 -2 2001 1 5.9 -1.9 2001 2 6.8 -0.7 2001 3 7.1 -1.6 2001 4 4 -5.9 2001 5 6.4 -4.6 2001 6 1.7 -9 2001 7 5 -12.8 2001 8 1.3 -19.6 2001 9 3.5 -20.8 2001 10 4.4 -21.5 2001 11 4 -17.7 2001 12 5.1 -5.5 2002 1 6.2 -5.4 2002 2 5.3 -3.5 2002 3 4.5 -9.5 2002 4 6 -7.2 2002 5 2.7 -12.3 2002 6 0.7 -18 2002 7 0 -21.8 2002 8 1.6 -16.7 2002 9 3.7 -9.3 2002 10 1.6 -15.1 2002 11 3 -8.2 2002 12 5.2 -2.9 2003 1 7.6 -1.6 2003 2 6.7 -0.7 2003 3 3.7 -4.1 2003 4 5.7 -7 2003 5 2.4 -10.7 2003 6 1.5 -10.1 2003 7 2.8 -9.5 2003 8 4.1 -13.4 2003 9 5.9 -26.1 2003 10 3.3 -15.4 2003 11 5.7 -10.5 2003 12 6.8 -11.6 2004 1 7.4 -11.8 2004 2 5.5 -2.7 2004 3 5.6 -6.4 2004 4 7.1 -4.8 2004 5 3.5 -9 2004 6 4.6 -10.2 2004 7 2.2 -19 2004 8 6.9 -25.7 2004 9 3.8 -24 2004 10 3.8 -20.4 2004 11 5.2 -13.3 2004 12 5.2 -5.5