Year Month Ra 1944 12 31.2 1945 01 18.5 1945 02 11.8 1945 03 19.7 1945 04 31.6 1945 05 26.6 1945 06 37.3 1945 07 37.4 1945 08 24.6 1945 09 34.0 1945 10 71.3 1945 11 46.3 1945 12 28.4 1946 01 55.2 1946 02 92.0 1946 03 87.5 1946 04 81.0 1946 05 83.5 1946 06 79.6 1946 07 115.1 1946 08 112.7 1946 09 115.7 1946 10 112.7 1946 11 136.2 1946 12 127.4 1947 01 128.2 1947 02 145.5 1947 03 153.0 1947 04 161.0 1947 05 224.2 1947 06 166.3 1947 07 166.6 1947 08 216.4 1947 09 195.0 1947 10 191.7 1947 11 155.0 1947 12 148.3 1948 01 130.1 1948 02 107.3 1948 03 103.8 1948 04 222.5 1948 05 194.8 1948 06 203.6 1948 07 184.3 1948 08 205.0 1948 09 174.6 1948 10 166.3 1948 11 129.9 1948 12 177.1 1949 01 153.3 1949 02 228.0 1949 03 198.8 1949 04 190.7 1949 05 147.4 1949 06 154.5 1949 07 153.6 1949 08 163.7 1949 09 183.7 1949 10 172.2 1949 11 190.9 1949 12 152.1 1950 01 125.8 1950 02 117.4 1950 03 134.6 1950 04 139.5 1950 05 129.8 1950 06 99.3 1950 07 104.7 1950 08 106.8 1950 09 65.4 1950 10 77.1 1950 11 72.8 1950 12 71.2 1951 01 53.8 1951 02 54.0 1951 03 49.0 1951 04 89.6 1951 05 91.7 1951 06 85.4 1951 07 58.3 1951 08 55.6 1951 09 85.2 1951 10 50.8 1951 11 56.7 1951 12 42.9 1952 01 38.6 1952 02 21.8 1952 03 23.3 1952 04 27.3 1952 05 22.2 1952 06 36.0 1952 07 39.4 1952 08 53.2 1952 09 26.1 1952 10 22.5 1952 11 22.5 1952 12 33.5 1953 01 26.6 1953 02 4.0 1953 03 7.9 1953 04 24.8 1953 05 10.9 1953 06 19.6 1953 07 6.4 1953 08 23.1 1953 09 15.7 1953 10 7.2 1953 11 1.7 1953 12 1.6 1954 01 0.1 1954 02 0.3 1954 03 8.0 1954 04 0.6 1954 05 0.2 1954 06 0.2 1954 07 2.1 1954 08 8.1 1954 09 0.3 1954 10 4.7 1954 11 8.0 1954 12 7.7 1955 01 23.3 1955 02 22.6 1955 03 4.7 1955 04 9.7 1955 05 24.7 1955 06 23.4 1955 07 23.2 1955 08 36.8 1955 09 40.7 1955 10 56.5 1955 11 82.0 1955 12 67.5 1956 01 67.2 1956 02 106.4 1956 03 105.9 1956 04 102.4 1956 05 117.3 1956 06 106.0 1956 07 117.9 1956 08 155.7 1956 09 159.5 1956 10 139.9 1956 11 173.1 1956 12 159.8 1957 01 129.1 1957 02 107.2 1957 03 133.5 1957 04 161.2 1957 05 151.5 1957 06 181.6 1957 07 160.4 1957 08 139.7 1957 09 207.2 1957 10 229.2 1957 11 191.3 1957 12 227.9 1958 01 199.2 1958 02 141.9 1958 03 187.0 1958 04 179.7 1958 05 171.9 1958 06 152.1 1958 07 178.2 1958 08 192.0 1958 09 198.4 1958 10 165.9 1958 11 126.7 1958 12 172.5 1959 01 199.3 1959 02 118.9 1959 03 158.3 1959 04 150.4 1959 05 139.6 1959 06 150.7 1959 07 141.6 1959 08 179.8 1959 09 136.4 1959 10 112.7 1959 11 122.3 1959 12 129.9 1960 01 146.1 1960 02 103.3 1960 03 93.0 1960 04 110.9 1960 05 104.1 1960 06 99.2 1960 07 107.6 1960 08 120.0 1960 09 114.8 1960 10 72.7 1960 11 78.8 1960 12 74.8 1961 01 46.3 1961 02 36.5 1961 03 46.3 1961 04 57.7 1961 05 40.9 1961 06 65.3 1961 07 59.8 1961 08 42.0 1961 09 51.4 1961 10 28.8 1961 11 27.2 1961 12 34.0 1962 01 29.7 1962 02 41.2 1962 03 34.0 1962 04 38.7 1962 05 34.8 1962 06 32.5 1962 07 15.6 1962 08 14.8 1962 09 41.4 1962 10 34.8 1962 11 22.6 1962 12 17.6 1963 01 14.7 1963 02 19.1 1963 03 12.8 1963 04 23.9 1963 05 36.8 1963 06 29.4 1963 07 15.7 1963 08 26.7 1963 09 31.2 1963 10 28.4 1963 11 19.2 1963 12 8.2 1964 01 11.6 1964 02 14.4 1964 03 11.1 1964 04 4.8 1964 05 6.8 1964 06 6.1 1964 07 2.2 1964 08 7.8 1964 09 2.1 1964 10 3.7 1964 11 5.3 1964 12 13.4 1965 01 15.6 1965 02 13.3 1965 03 9.1 1965 04 6.4 1965 05 17.7 1965 06 11.4 1965 07 7.7 1965 08 4.5 1965 09 15.0 1965 10 15.6 1965 11 14.2 1965 12 14.3 1966 01 20.9 1966 02 22.8 1966 03 19.4 1966 04 34.6 1966 05 30.5 1966 06 36.6 1966 07 47.2 1966 08 46.1 1966 09 40.9 1966 10 50.6 1966 11 50.0 1966 12 64.3 1967 01 101.4 1967 02 85.6 1967 03 105.0 1967 04 61.9 1967 05 87.2 1967 06 62.3 1967 07 82.4 1967 08 96.7 1967 09 68.5 1967 10 84.2 1967 11 82.6 1967 12 117.2 1968 01 113.5 1968 02 99.2 1968 03 80.6 1968 04 67.0 1968 05 124.3 1968 06 101.8 1968 07 90.2 1968 08 99.5 1968 09 113.0 1968 10 99.4 1968 11 79.0 1968 12 102.4 1969 01 103.5 1969 02 113.3 1969 03 134.0 1969 04 102.4 1969 05 120.9 1969 06 105.5 1969 07 92.5 1969 08 96.3 1969 09 88.9 1969 10 96.4 1969 11 94.7 1969 12 106.7 1970 01 113.7 1970 02 132.2 1970 03 98.3 1970 04 104.1 1970 05 124.3 1970 06 101.3 1970 07 114.0 1970 08 98.1 1970 09 106.6 1970 10 98.1 1970 11 107.5 1970 12 90.4 1971 01 90.8 1971 02 77.8 1971 03 61.1 1971 04 74.9 1971 05 54.6 1971 06 44.9 1971 07 83.0 1971 08 60.2 1971 09 50.3 1971 10 52.3 1971 11 64.9 1971 12 83.0 1972 01 60.9 1972 02 87.0 1972 03 80.8 1972 04 62.7 1972 05 75.7 1972 06 81.7 1972 07 74.5 1972 08 73.8 1972 09 66.2 1972 10 63.0 1972 11 39.4 1972 12 42.3 1973 01 38.8 1973 02 40.5 1973 03 44.9 1973 04 56.4 1973 05 39.5 1973 06 37.9 1973 07 20.8 1973 08 25.5 1973 09 61.3 1973 10 30.0 1973 11 24.2 1973 12 20.5 1974 01 27.4 1974 02 25.2 1974 03 19.1 1974 04 36.6 1974 05 36.7 1974 06 32.6 1974 07 50.0 1974 08 32.7 1974 09 39.6 1974 10 48.4 1974 11 21.3 1974 12 18.5 1975 01 16.7 1975 02 11.2 1975 03 10.3 1975 04 4.0 1975 05 7.3 1975 06 10.3 1975 07 28.5 1975 08 39.1 1975 09 11.9 1975 10 8.1 1975 11 18.8 1975 12 6.6 1976 01 8.3 1976 02 3.8 1976 03 21.1 1976 04 16.9 1976 05 11.2 1976 06 10.9 1976 07 1.4 1976 08 13.7 1976 09 12.8 1976 10 19.1 1976 11 4.3 1976 12 15.5 1977 01 15.5 1977 02 23.0 1977 03 8.0 1977 04 10.7 1977 05 16.0 1977 06 34.4 1977 07 18.3 1977 08 27.6 1977 09 41.9 1977 10 45.5 1977 11 28.4 1977 12 42.8 1978 01 48.8 1978 02 90.9 1978 03 73.9 1978 04 97.5 1978 05 79.6 1978 06 88.0 1978 07 58.1 1978 08 48.1 1978 09 128.1 1978 10 116.0 1978 11 92.8 1978 12 121.0 1979 01 164.4 1979 02 136.8 1979 03 132.5 1979 04 95.8 1979 05 121.8 1979 06 136.4 1979 07 140.5 1979 08 125.1 1979 09 184.0 1979 10 178.2 1979 11 176.5 1979 12 157.6 1980 01 146.7 1980 02 131.0 1980 03 111.0 1980 04 148.7 1980 05 176.5 1980 06 158.8 1980 07 144.7 1980 08 134.5 1980 09 151.4 1980 10 163.0 1980 11 155.6 1980 12 166.9 1981 01 115.4 1981 02 143.7 1981 03 149.2 1981 04 169.2 1981 05 141.3 1981 06 99.0 1981 07 154.3 1981 08 170.4 1981 09 174.5 1981 10 157.0 1981 11 138.8 1981 12 145.0 1982 01 110.4 1982 02 161.0 1982 03 155.5 1982 04 121.9 1982 05 82.6 1982 06 113.5 1982 07 103.5 1982 08 110.5 1982 09 117.8 1982 10 90.1 1982 11 93.2 1982 12 121.7 1983 01 82.8 1983 02 53.4 1983 03 60.5 1983 04 74.5 1983 05 97.7 1983 06 93.1 1983 07 82.2 1983 08 69.2 1983 09 47.4 1983 10 52.3 1983 11 30.2 1983 12 32.3 1984 01 54.4 1984 02 81.5 1984 03 83.0 1984 04 66.5 1984 05 72.1 1984 06 45.2 1984 07 36.2 1984 08 24.5 1984 09 13.6 1984 10 9.8 1984 11 19.4 1984 12 17.0 1985 01 14.5 1985 02 16.3 1985 03 11.8 1985 04 17.1 1985 05 24.0 1985 06 22.2 1985 07 30.8 1985 08 10.7 1985 09 3.4 1985 10 16.5 1985 11 16.4 1985 12 10.1 1986 01 2.3 1986 02 23.8 1986 03 12.5 1986 04 13.8 1986 05 11.6 1986 06 0.8 1986 07 17.7 1986 08 7.6 1986 09 3.5 1986 10 19.8 1986 11 14.4 1986 12 5.1 1987 01 9.4 1987 02 3.0 1987 03 13.3 1987 04 39.4 1987 05 30.7 1987 06 18.0 1987 07 34.3 1987 08 39.0 1987 09 34.0 1987 10 55.8 1987 11 42.5 1987 12 26.7 1988 01 56.8 1988 02 39.1 1988 03 77.5 1988 04 90.9 1988 05 64.7 1988 06 106.4 1988 07 108.7 1988 08 111.2 1988 09 122.2 1988 10 126.0 1988 11 125.3 1988 12 179.2 1989 01 159.1 1989 02 163.9 1989 03 139.8 1989 04 131.6 1989 05 156.4 1989 06 217.5 1989 07 133.8 1989 08 173.5 1989 09 177.6 1989 10 161.0 1989 11 172.9 1989 12 161.6 1990 01 177.6 1990 02 134.6 1990 03 145.0 1990 04 144.3 1990 05 132.5 1990 06 112.8 1990 07 143.2 1990 08 193.5 1990 09 125.6 1990 10 150.1 1990 11 133.6 1990 12 145.9 1991 01 140.7 1991 02 171.8 1991 03 147.7 1991 04 135.7 1991 05 119.4 1991 06 158.3 1991 07 166.3 1991 08 171.9 1991 09 120.7 1991 10 146.1 1991 11 109.9 1991 12 144.2 1992 01 142.0 1992 02 157.0 1992 03 105.1 1992 04 97.1 1992 05 68.5 1992 06 69.6 1992 07 84.3 1992 08 67.6 1992 09 66.0 1992 10 93.3 1992 11 89.1 1992 12 85.0 1993 01 61.7 1993 02 90.1 1993 03 72.5 1993 04 65.7 1993 05 54.9 1993 06 49.5 1993 07 57.4 1993 08 42.7 1993 09 23.1 1993 10 51.2 1993 11 35.6 1993 12 52.0 1994 01 59.7 1994 02 40.4 1994 03 36.5 1994 04 17.7 1994 05 19.9 1994 06 27.0 1994 07 33.8 1994 08 23.5 1994 09 26.3 1994 10 43.7 1994 11 18.6 1994 12 24.7 1995 01 23.9 1995 02 32.0 1995 03 32.8 1995 04 15.3 1995 05 14.8 1995 06 17.0 1995 07 14.9 1995 08 15.1 1995 09 12.5 1995 10 20.3 1995 11 10.6 1995 12 10.0 1996 01 10.9 1996 02 5.9 1996 03 8.3 1996 04 5.4 1996 05 6.3 1996 06 11.6 1996 07 8.1 1996 08 13.2 1996 09 1.8 1996 10 1.2 1996 11 16.1 1996 12 12.0 1997 01 5.5 1997 02 7.9 1997 03 7.9 1997 04 15.8 1997 05 17.8 1997 06 13.8 1997 07 7.7 1997 08 23.8 1997 09 43.9 1997 10 22.6 1997 11 37.7 1997 12 38.9 1998 01 31.2 1998 02 34.6 1998 03 58.0 1998 04 48.8 1998 05 54.7 1998 06 60.4 1998 07 66.3 1998 08 88.6 1998 09 92.3 1998 10 48.9 1998 11 68.8 1998 12 86.4 1999 01 59.6 1999 02 67.0 1999 03 66.6 1999 04 65.2 1999 05 101.6 1999 06 142.1 1999 07 122.9 1999 08 98.0 1999 09 77.5 1999 10 121.8 1999 11 143.0 1999 12 86.5 2000 01 93.6 2000 02 113.8 2000 03 148.6 2000 04 134.9 2000 05 115.7 2000 06 139.8 2000 07 175.0 2000 08 126.8 2000 09 116.5 2000 10 102.0 2000 11 112.0 2000 12 101.2 2001 01 102.6 2001 02 87.5 2001 03 126.1 2001 04 120.6 2001 05 101.6 2001 06 148.4 2001 07 86.5 2001 08 117.1 2001 09 173.3 2001 10 139.5 2001 11 124.2 2001 12 151.5 2002 01 120.0 2002 02 114.0 2002 03 96.0 2002 04 125.8 2002 05 129.1 2002 06 86.7 2002 07 108.2 2002 08 117.7 2002 09 126.2 2002 10 103.5 2002 11 98.7 2002 12 87.7 2003 01 85.3 2003 02 51.3 2003 03 66.1 2003 04 64.4 2003 05 55.1 2003 06 78.2 2003 07 83.2 2003 08 75.5 2003 09 51.5 2003 10 70.0 2003 11 60.9 2003 12 47.6 2004 01 39.4 2004 02 50.0 2004 03 50.8 2004 04 37.9 2004 05 47.4 2004 06 41.9 2004 07 55.9 2004 08 48.5 2004 09 32.8 2004 10 49.7 2004 11 46.7 2004 12 18.9 2005 01 31.5 2005 02 28.3 2005 03 24.5 2005 04 24.9 2005 05 39.7 2005 06 38.7 2005 07 42.9 2005 08 39.2 2005 09 24.8 2005 10 8.9 2005 11 18.7 2005 12 50.3 2006 01 15.1 2006 02 3.0 2006 03 9.9 2006 04 32.2 2006 05 22.6 2006 06 14.7 2006 07 13.9 2006 08 13.3 2006 09 14.7 2006 10 9.6 2006 11 21.5 2006 12 13.5 2007 01 19.5 2007 02 11.2 2007 03 3.7 2007 04 3.6 2007 05 12.5 2007 06 12.8 2007 07 10.1 2007 08 6.5 2007 09 2.8 2007 10 0.9 2007 11 1.0 2007 12 10.6 2008 01 2.3 2008 02 1.6 2008 03 9.8 2008 04 2.2 2008 05 2.5 2008 06 3.0 2008 07 0.4 2008 08 0.2 2008 09 0.5 2008 10 2.4 2008 11 3.6 2008 12 0.5 2009 01 1.3 2009 02 0.7 2009 03 0.3 2009 04 0.4 2009 05 1.6 2009 06 3.2 2009 07 3.6 2009 08 0.0 2009 09 4.5 2009 10 4.5 2009 11 3.3 2009 12 10.4 2010 01 13.3 2010 02 19.4 2010 03 15.4 2010 04 7.0 2010 05 8.4 2010 06 11.0 2010 07 15.2 2010 08 18.3 2010 09 22.8 2010 10 21.0 2010 11 20.9 2010 12 13.9 2011 01 17.7 2011 02 29.1 2011 03 48.0 2011 04 47.3 2011 05 37.3 2011 06 35.2 2011 07 41.5 2011 08 42.4 2011 09 73.8 2011 10 78.9 2011 11 84.6 2011 12 65.8 2012 01 55.8 2012 02 29.2 2012 03 53.1 2012 04 51.4 2012 05 61.8 2012 06 59.7 2012 07 64.2 2012 08 57.7 2012 09 57.7 2012 10 48.3 2012 11 56.7 2012 12 37.4 2013 01 63.8 2013 02 37.8 2013 03 50.6 2013 04 70.6 2013 05 77.4 2013 06 51.0 2013 07 57.0 2013 08 60.0 2013 09 34.6 2013 10 74.5 2013 11 73.9 2013 12 77.8 2014 01 77.4 2014 02 93.9 2014 03 80.9 2014 04 76.9 2014 05 72.3 2014 06 67.2 2014 07 72.5 2014 08 71.2 2014 09 83.2 2014 10 59.5 2014 11 65.7 2014 12 75.7 2015 01 65.9 2015 02 42.4 2015 03 37.4 2015 04 49.1 2015 05 56.3 2015 06 50.2 2015 07 48.0 2015 08 39.5 2015 09 49.3 2015 10 39.3 2015 11 39.7 2015 12 36.3 2016 01 33.7 2016 02 38.4 2016 03 30.5 2016 04 26.6 2016 05 33.7 2016 06 13.1 2016 07 21.3 2016 08 33.0 2016 09 27.7 2016 10 22.8 2016 11 14.0 2016 12 11.0 2017 01 18.4 2017 02 14.4 2017 03 11.3 2017 04 21.5 2017 05 12.5 2017 06 15.0 2017 07 11.5 2017 08 22.8 2017 09 34.6 2017 10 10.5 2017 11 4.2 2017 12 4.4 2018 01 3.1 2018 02 6.8 2018 03 1.1 2018 04 4.7 2018 05 8.4 2018 06 10.2 2018 07 0.5 2018 08 5.9 2018 09 1.6 2018 10 2.5 2018 11 3.1 2018 12 1.6 2019 01 5.4 2019 02 0.1 2019 03 6.1 2019 04 6.2 2019 05 7.0 2019 06 0.7 2019 07 0.4 2019 08 0.3 2019 09 0.5 2019 10 0.2 2019 11 0.3 2019 12 0.8 2020 01 4.0 2020 02 0.1 2020 03 1.2 2020 04 3.0 2020 05 0.1 2020 06 3.9 2020 07 4.2 2020 08 5.3 2020 09 0.4 2020 10 9.9 2020 11 21.2 2020 12 15.4 2021 01 7.0 2021 02 5.8 2021 03 11.0 2021 04 18.5 2021 05 15.9 2021 06 19.9 2021 07 23.8 2021 08 15.7 2021 09 39.1 2021 10 27.1 2021 11 27.2 2021 12 50.6 2022 01 43.9 2022 02 48.8 2022 03 58.4 2022 04 59.1 2022 05 72.5 2022 06 58.9 2022 07 76.7 2022 08 63.3 2022 09 72.6 2022 10 27.1 2022 11 54.3 2022 12 93.7 2023 01 112.9 2023 02 89.6 2023 03 85.0 2023 04 72.1 2023 05 105.0 2023 06 118.5 2023 07 124.7 2023 08 90.6 2023 09 110.4 2023 10 78.4 2023 11 88.6 2023 12 98.2 2024 01 102.8 2024 02 94.8 2024 03 84.8 2024 04 107.1 2024 05 120.5 2024 06 124.8