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% 27.50%
1911 12.90% 36.80%
1912 0.00% 13.40%
1913 5.00% 25.00%
1914 5.00% 19.80%
1915 0.00% 31.80%
1916 14.90% 9.90%
1917 5.10% 5.20%
1918 0.00% 5.00%
1919 0.00% 5.30%
1920 0.00% 9.60%
1921 0.00% 24.90%
1922 0.00% 42.10%
1923 0.00% 38.50%
1924 0.00% 39.80%
1925 5.40% 0.00%
1926 9.50% 4.80%
1927 4.60% 4.70%
1928 4.40% 9.10%
1929 12.70% 4.40%
1930 0.00% 45.70%
1931 0.00% 32.30%
1932 4.60% 29.00%
1933 0.00% 22.50%
1934 0.00% 31.80%
1935 9.10% 13.40%
1936 8.90% 4.50%
1937 8.50% 4.30%
1938 8.70% 0.00%
1939 8.70% 17.30%
1940 13.30% 4.30%
1941 0.00% 43.50%
1942 13.50% 0.00%
1943 8.70% 4.40%
1944 0.00% 27.00%
1945 63.70% 0.00%
1946 0.00% 18.40%
1947 8.60% 8.70%
1948 9.00% 8.40%
1949 0.00% 4.40%
1950 31.00% 0.00%
1951 8.40% 0.00%
1952 0.00% 8.70%
1953 0.00% 0.00%
1954 25.50% 4.50%
1955 0.00% 9.30%
1956 21.80% 0.00%
1957 4.20% 25.70%
1958 0.00% 0.00%
1959 0.00% 0.00%
1960 0.00% 0.00%
1961 0.00% 4.30%
1962 0.00% 13.20%
1963 0.00% 17.70%
1964 0.00% 13.00%
1965 0.00% 0.00%
1966 0.00% 8.70%
1967 0.00% 0.00%
1968 4.30% 4.50%
1969 0.00% 4.30%
1970 17.60% 0.00%
1971 0.00% 8.60%
1972 50.40% 0.00%
1973 4.60% 0.00%
1974 13.50% 4.70%
1975 18.50% 0.00%
1976 13.00% 4.50%
1977 12.80% 0.00%
1978 0.00% 17.90%
1979 17.60% 4.30%
1980 0.00% 8.80%
1981 4.50% 0.00%
1982 0.00% 4.50%
1983 0.00% 0.00%
1984 18.40% 0.00%
1985 30.10% 0.00%
1986 4.80% 0.00%
1987 0.00% 4.30%
1988 4.60% 9.30%
1989 31.90% 0.00%
1990 8.70% 0.00%
1991 0.00% 17.40%
1992 30.60% 4.20%
1993 18.00% 0.00%
1994 4.40% 4.40%
1995 0.00% 12.90%
1996 38.90% 0.00%
1997 17.20% 4.20%
1998 4.30% 4.30%
1999 0.00% 26.30%
2000 13.00% 8.90%
2001 4.60% 23.10%
2002 9.10% 9.10%
2003 62.30% 0.00%
2004 43.60% 4.20%
2005 17.20% 4.20%
2006 18.70% 5.00%
2007 0.00% 19.10%
2008 57.10% 9.30%
2009 20.10% 5.00%
2010 0.00% 15.30%
2011 70.30% 0.00%
2012 5.50% 11.40%

*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.