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% 47.10%
1911 6.80% 16.40%
1912 7.20% 14.10%
1913 5.40% 12.70%
1914 7.90% 16.70%
1915 12.60% 11.20%
1916 4.00% 18.00%
1917 2.20% 27.70%
1918 3.60% 13.20%
1919 5.70% 11.80%
1920 2.60% 11.40%
1921 1.20% 17.60%
1922 7.60% 16.10%
1923 8.00% 15.40%
1924 2.00% 30.90%
1925 2.20% 16.10%
1926 8.80% 8.50%
1927 9.70% 5.50%
1928 2.90% 15.30%
1929 9.70% 18.80%
1930 2.20% 20.50%
1931 4.10% 18.70%
1932 5.50% 10.50%
1933 0.80% 19.20%
1934 0.60% 27.30%
1935 6.10% 9.90%
1936 3.20% 19.70%
1937 9.40% 4.90%
1938 5.60% 6.50%
1939 2.20% 20.40%
1940 9.50% 3.10%
1941 34.40% 8.20%
1942 9.00% 2.60%
1943 1.20% 17.50%
1944 8.60% 6.50%
1945 20.70% 3.70%
1946 4.30% 6.00%
1947 8.30% 6.00%
1948 10.30% 6.70%
1949 14.30% 5.90%
1950 13.80% 9.70%
1951 16.80% 3.90%
1952 3.10% 16.80%
1953 6.10% 15.60%
1954 3.10% 21.60%
1955 2.80% 11.50%
1956 3.20% 20.80%
1957 33.70% 2.40%
1958 11.80% 6.00%
1959 8.90% 11.30%
1960 5.20% 4.50%
1961 9.20% 7.00%
1962 4.00% 6.40%
1963 2.50% 15.80%
1964 5.10% 8.10%
1965 14.90% 3.70%
1966 1.60% 12.90%
1967 4.60% 4.20%
1968 12.70% 2.60%
1969 8.40% 2.50%
1970 6.40% 7.30%
1971 9.20% 3.40%
1972 13.50% 3.20%
1973 22.00% 3.00%
1974 9.80% 4.90%
1975 18.00% 3.00%
1976 2.60% 24.00%
1977 10.60% 1.80%
1978 9.70% 4.80%
1979 8.40% 3.00%
1980 3.40% 9.50%
1981 6.40% 3.50%
1982 23.60% 0.50%
1983 33.10% 1.60%
1984 20.40% 2.20%
1985 14.00% 5.50%
1986 12.50% 1.50%
1987 7.30% 6.30%
1988 1.10% 13.00%
1989 9.90% 10.80%
1990 9.80% 9.80%
1991 14.40% 4.60%
1992 23.10% 3.30%
1993 26.30% 1.80%
1994 7.90% 4.90%
1995 15.00% 5.30%
1996 22.80% 4.40%
1997 14.20% 2.60%
1998 27.30% 4.20%
1999 4.20% 11.10%
2000 5.60% 5.90%
2001 3.50% 6.30%
2002 3.10% 12.30%
2003 13.10% 5.10%
2004 20.70% 2.50%
2005 9.00% 4.90%
2006 12.40% 8.80%
2007 11.60% 13.50%
2008 17.70% 5.60%
2009 21.80% 3.30%
2010 21.60% 9.30%
2011 21.80% 8.50%
2012 6.70% 16.60%

*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.