Number of rain gauges contributing to the Sahel rainfall index. 1 -999 1898 2004 Number of rain gauges contributing to the Sahel rainfall index. http://jisao.washington.edu/data/sahel/ Todd Mitchell, May 2005. 1898 2004 1 jan feb mar apr may jun jul aug sep oct nov dec 1898 1 1 1 1 1 1 1 1 1 1 1 1 1899 1 1 1 1 1 1 1 1 1 1 1 1 1900 1 1 1 1 1 1 1 1 1 1 1 1 1901 1 1 1 1 1 1 1 1 1 1 1 1 1902 1 1 1 1 1 1 1 1 1 1 1 1 1903 1 1 1 1 1 1 1 1 1 1 1 1 1904 1 1 1 1 1 1 1 1 1 1 1 1 1905 1 1 1 1 1 1 1 1 1 1 1 1 1906 1 1 1 1 1 1 1 1 1 1 1 1 1907 2 2 2 2 2 2 2 2 2 2 2 2 1908 2 2 2 2 2 2 2 2 2 2 2 2 1909 2 2 2 2 2 2 2 2 2 2 2 2 1910 2 2 2 2 2 2 2 2 2 2 2 2 1911 2 2 2 2 2 2 2 2 2 2 2 2 1912 2 2 2 2 2 2 2 2 2 2 2 2 1913 2 2 2 2 2 2 2 2 2 2 2 2 1914 2 2 2 2 2 2 2 2 2 2 2 2 1915 1 1 1 1 1 1 1 1 1 1 1 2 1916 1 1 1 1 1 1 1 1 1 1 1 2 1917 1 1 1 1 1 1 1 1 1 1 1 2 1918 2 2 1 2 2 2 2 2 2 2 2 3 1919 3 3 2 3 3 3 3 4 5 5 4 4 1920 5 5 4 5 6 6 6 6 6 5 5 5 1921 7 7 6 8 9 9 9 10 10 10 10 8 1922 11 11 10 11 11 11 11 11 11 11 11 10 1923 11 11 10 11 11 11 11 11 11 11 11 10 1924 11 11 10 11 11 11 11 11 11 11 11 10 1925 11 11 10 11 11 11 11 11 11 11 11 10 1926 10 11 10 11 11 11 11 11 11 11 11 10 1927 11 11 10 11 11 11 11 11 10 11 11 10 1928 11 11 10 11 11 11 11 11 11 11 11 10 1929 10 10 9 10 10 10 10 10 10 10 10 9 1930 10 10 9 10 10 10 10 10 10 10 10 9 1931 10 10 9 10 10 10 11 11 11 11 12 11 1932 12 11 11 12 12 12 12 12 12 12 13 12 1933 11 10 11 12 12 12 12 12 11 12 13 12 1934 12 11 11 12 12 12 12 12 12 12 13 12 1935 12 11 11 13 13 13 13 13 13 13 13 12 1936 12 11 11 13 13 13 13 13 13 13 13 12 1937 13 12 12 13 13 13 13 13 13 13 13 11 1938 13 12 12 13 13 13 13 13 13 13 13 12 1939 13 12 13 13 13 12 13 13 13 13 13 12 1940 13 12 12 13 13 13 13 13 13 13 13 12 1941 13 12 12 13 13 13 13 13 12 13 13 12 1942 13 12 12 13 13 13 13 13 13 13 13 12 1943 13 12 12 13 13 13 13 13 13 12 13 12 1944 12 11 11 12 13 13 13 13 13 13 13 12 1945 12 11 12 12 12 12 12 12 12 12 12 11 1946 12 11 11 12 12 12 12 12 12 12 12 11 1947 13 12 12 13 13 13 13 13 13 13 13 12 1948 13 12 12 13 13 13 13 13 13 13 13 12 1949 13 12 12 13 12 12 13 13 13 13 13 12 1950 13 12 12 13 13 13 13 13 13 13 13 12 1951 14 13 13 13 14 14 14 14 14 14 14 13 1952 14 13 13 14 14 14 14 14 14 14 14 13 1953 14 13 12 14 14 14 14 14 14 14 14 13 1954 14 13 13 14 14 14 14 14 14 14 14 13 1955 14 13 13 14 14 14 14 14 14 14 14 13 1956 14 13 13 14 14 14 14 14 14 14 14 13 1957 14 13 13 14 14 14 14 14 14 14 14 13 1958 14 13 13 14 14 14 14 14 14 14 14 13 1959 13 12 12 13 13 13 13 13 13 13 13 12 1960 12 11 11 12 12 12 12 12 12 13 13 12 1961 10 9 10 10 11 14 7 12 10 10 10 7 1962 8 12 10 9 11 8 8 10 10 9 11 11 1963 11 11 13 11 11 11 11 11 11 11 11 13 1964 13 12 13 12 11 12 13 12 14 14 14 13 1965 14 13 11 12 11 10 11 11 10 11 11 10 1966 12 12 11 12 14 14 14 14 13 13 14 12 1967 13 12 12 13 14 14 12 13 13 14 13 13 1968 13 12 13 14 14 14 13 14 14 13 13 11 1969 14 13 13 14 14 14 13 14 13 14 14 13 1970 14 12 13 14 14 14 14 14 14 14 14 13 1971 14 13 11 13 13 13 14 13 14 14 14 13 1972 14 13 13 13 8 14 13 14 14 13 10 8 1973 14 13 12 13 14 13 14 14 14 14 13 13 1974 12 11 11 13 13 13 13 13 12 13 13 12 1975 12 11 11 12 12 12 12 12 11 12 12 11 1976 12 11 12 12 12 12 12 13 12 9 9 7 1977 12 12 13 13 13 12 11 11 12 7 8 7 1978 13 12 13 13 13 12 13 13 13 13 12 12 1979 13 11 13 13 13 12 12 12 12 11 12 11 1980 12 10 13 12 11 13 9 9 8 8 9 7 1981 9 7 8 8 6 7 9 7 7 8 2 1 1982 11 9 9 12 8 11 9 11 11 12 10 9 1983 12 9 13 10 9 10 12 12 11 13 12 12 1984 13 12 12 12 12 10 11 10 10 11 8 6 1985 7 11 11 11 12 11 11 9 11 9 12 10 1986 11 9 11 11 10 12 3 3 13 7 11 8 1987 11 8 13 13 10 11 11 12 13 12 11 11 1988 13 10 13 13 11 11 11 10 12 9 12 12 1989 13 11 13 12 12 12 11 12 11 12 13 11 1990 13 11 13 13 9 9 9 11 13 13 12 10 1991 12 10 12 9 12 11 2 5 11 6 2 2 1992 9 7 7 7 11 11 9 10 12 10 11 8 1993 9 11 13 11 11 9 9 11 12 11 7 11 1994 13 10 5 10 12 11 13 13 10 13 12 12 1995 13 6 10 12 13 11 11 12 11 13 13 12 1996 13 11 13 10 12 11 11 12 13 11 12 11 1997 11 11 12 13 12 10 4 9 12 8 10 9 1998 11 11 10 10 9 8 10 11 13 12 8 9 1999 12 12 10 9 11 10 9 10 10 8 8 9 2000 6 8 9 8 7 10 9 8 10 11 3 10 2001 9 8 10 8 1 11 9 9 9 8 10 10 2002 4 6 12 9 10 9 9 7 9 9 7 9 2003 8 6 5 6 10 10 6 11 8 9 11 6 2004 1 8 7 8 3 4 9 9 6 6 5 4