U.S. Climate Extremes Index (CEI)

Graph

Choose a period/season and an indicator from the options below and click "Plot" to create a time series graph. Note that the sixth indicator (Step 6) is not calculated for the spring (March-May), winter (December-February) and cold (October-March) seasons since most months during these periods are outside of the traditional hurricane season.



Move mouse towards an axis until highlighted. Left-click mouse to pan. Shift key + left-click to zoom.

Download: Wet Data | Dry Data
Year Wet Dry
1910 0.00% 65.10%
1911 8.30% 11.50%
1912 0.00% 21.50%
1913 3.60% 14.10%
1914 33.10% 10.50%
1915 3.30% 13.40%
1916 0.00% 16.60%
1917 0.00% 33.10%
1918 13.30% 6.70%
1919 10.30% 9.60%
1920 3.50% 24.00%
1921 7.10% 20.10%
1922 3.70% 25.00%
1923 9.40% 6.50%
1924 0.00% 51.80%
1925 3.10% 13.10%
1926 16.90% 6.30%
1927 3.40% 0.00%
1928 3.10% 16.30%
1929 0.00% 18.70%
1930 6.80% 6.30%
1931 20.10% 12.20%
1932 0.00% 15.90%
1933 0.00% 12.20%
1934 0.00% 34.50%
1935 6.90% 6.50%
1936 3.30% 10.00%
1937 0.00% 6.70%
1938 3.00% 6.50%
1939 0.00% 28.50%
1940 9.70% 0.00%
1941 69.20% 0.00%
1942 3.30% 10.60%
1943 0.00% 12.50%
1944 3.30% 6.40%
1945 9.10% 13.20%
1946 9.80% 3.10%
1947 6.90% 3.70%
1948 3.20% 25.70%
1949 26.90% 0.00%
1950 0.00% 42.70%
1951 9.50% 0.00%
1952 3.20% 0.00%
1953 0.00% 37.60%
1954 0.00% 9.20%
1955 3.00% 6.40%
1956 0.00% 51.10%
1957 55.90% 0.00%
1958 28.20% 3.30%
1959 6.20% 6.10%
1960 9.50% 0.00%
1961 18.50% 0.00%
1962 3.20% 6.10%
1963 8.90% 6.20%
1964 0.00% 12.70%
1965 37.20% 0.00%
1966 0.00% 12.30%
1967 6.00% 3.20%
1968 3.20% 0.00%
1969 22.90% 0.00%
1970 6.30% 13.90%
1971 3.00% 3.30%
1972 0.00% 3.30%
1973 3.10% 3.40%
1974 0.00% 9.30%
1975 6.60% 13.50%
1976 0.00% 12.40%
1977 0.00% 3.10%
1978 31.60% 9.80%
1979 0.00% 0.00%
1980 6.40% 16.20%
1981 9.10% 0.00%
1982 25.70% 0.00%
1983 49.80% 0.00%
1984 34.30% 0.00%
1985 15.70% 0.00%
1986 27.00% 0.00%
1987 29.80% 0.00%
1988 3.20% 0.00%
1989 3.20% 29.60%
1990 22.60% 0.00%
1991 12.50% 3.20%
1992 42.70% 0.00%
1993 19.20% 0.00%
1994 6.60% 0.00%
1995 12.30% 3.30%
1996 9.50% 10.30%
1997 30.40% 0.00%
1998 31.70% 3.30%
1999 3.20% 3.40%
2000 3.10% 3.40%
2001 3.50% 3.50%
2002 0.00% 23.30%
2003 0.00% 10.30%
2004 10.00% 0.00%
2005 3.10% 0.00%
2006 0.00% 3.60%
2007 6.30% 12.70%
2008 3.50% 7.70%
2009 7.20% 7.90%
2010 3.40% 0.00%
2011 9.70% 4.80%
2012 0.00% 24.30%

*As of September 2005, the fourth and fifth indicators are computed with data from one station per each grid box rather than multiple stations. This was done to eliminate many of the artificial extremes which resulted from a changing number of available stations over time. Therefore, the percentages in the step 4 and 5 graphs above will likely be significantly different from the percentages calculated prior to the changes implemented in September 2005.

View CEI Data Files

Limitations: Statistics for the most recent period/season are computed from a fraction of the U.S. which has data available at that time. Extreme percentage values can and will likely change as final quality controlled data become available and fill in the data gaps.