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% 15.60%
1911 0.00% 43.20%
1912 13.30% 0.00%
1913 0.00% 12.20%
1914 0.00% 32.70%
1915 0.00% 15.70%
1916 0.00% 20.60%
1917 0.00% 15.70%
1918 0.00% 16.00%
1919 0.00% 33.10%
1920 0.00% 12.50%
1921 0.00% 6.20%
1922 0.00% 34.60%
1923 0.00% 11.50%
1924 0.00% 42.30%
1925 0.00% 20.70%
1926 0.00% 16.30%
1927 5.70% 0.00%
1928 0.00% 47.10%
1929 0.00% 75.20%
1930 0.00% 59.00%
1931 0.00% 15.20%
1932 5.10% 5.20%
1933 5.20% 0.00%
1934 0.00% 5.40%
1935 0.00% 54.60%
1936 0.00% 26.00%
1937 10.10% 0.00%
1938 0.00% 0.00%
1939 0.00% 16.00%
1940 20.50% 5.00%
1941 15.30% 0.00%
1942 0.00% 0.00%
1943 0.00% 24.90%
1944 0.00% 26.30%
1945 21.30% 0.00%
1946 4.80% 0.00%
1947 4.80% 0.00%
1948 36.50% 0.00%
1949 0.00% 35.10%
1950 39.60% 0.00%
1951 0.00% 9.90%
1952 0.00% 35.00%
1953 39.90% 0.00%
1954 0.00% 10.10%
1955 9.70% 5.20%
1956 0.00% 5.20%
1957 5.10% 5.20%
1958 0.00% 0.00%
1959 19.40% 10.50%
1960 0.00% 0.00%
1961 0.00% 5.20%
1962 0.00% 0.00%
1963 4.90% 4.90%
1964 31.30% 0.00%
1965 0.00% 29.90%
1966 4.80% 5.10%
1967 0.00% 19.80%
1968 24.80% 0.00%
1969 0.00% 9.80%
1970 0.00% 0.00%
1971 20.80% 0.00%
1972 0.00% 0.00%
1973 5.50% 0.00%
1974 10.20% 0.00%
1975 29.60% 0.00%
1976 0.00% 25.40%
1977 9.90% 0.00%
1978 14.90% 0.00%
1979 5.00% 5.00%
1980 14.90% 0.00%
1981 31.50% 0.00%
1982 26.30% 0.00%
1983 80.40% 0.00%
1984 49.60% 0.00%
1985 0.00% 25.90%
1986 0.00% 0.00%
1987 0.00% 16.30%
1988 0.00% 0.00%
1989 0.00% 10.00%
1990 25.00% 4.90%
1991 5.50% 0.00%
1992 0.00% 5.30%
1993 16.30% 5.00%
1994 5.50% 5.40%
1995 28.20% 0.00%
1996 56.50% 0.00%
1997 11.00% 0.00%
1998 48.40% 0.00%
1999 26.10% 0.00%
2000 0.00% 0.00%
2001 0.00% 0.00%
2002 0.00% 10.10%
2003 10.00% 0.00%
2004 5.90% 6.20%
2005 0.00% 5.70%
2006 28.10% 0.00%
2007 19.70% 0.00%
2008 5.60% 5.70%
2009 0.00% 5.40%
2010 61.50% 5.70%
2011 39.90% 0.00%
2012 27.00% 0.00%

*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.