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.

Year Percent
1910 17.00%
1911 23.80%
1912 20.70%
1913 7.10%
1914 28.40%
1915 20.40%
1916 20.40%
1917 6.70%
1918 12.80%
1919 26.90%
1920 10.40%
1921 27.50%
1922 17.60%
1923 15.80%
1924 6.90%
1925 6.20%
1926 12.90%
1927 10.80%
1928 6.50%
1929 9.50%
1930 12.70%
1931 6.50%
1932 9.50%
1933 12.60%
1934 6.90%
1935 13.70%
1936 6.50%
1937 19.80%
1938 9.30%
1939 12.80%
1940 6.70%
1941 6.30%
1942 13.90%
1943 3.20%
1944 3.50%
1945 3.30%
1946 0.00%
1947 13.90%
1948 6.60%
1949 3.40%
1950 3.40%
1951 9.50%
1952 3.30%
1953 3.20%
1954 3.20%
1955 12.70%
1956 0.00%
1957 0.00%
1958 6.50%
1959 3.10%
1960 6.30%
1961 9.10%
1962 3.20%
1963 0.00%
1964 0.00%
1965 19.90%
1966 18.60%
1967 16.10%
1968 6.60%
1969 0.00%
1970 6.70%
1971 6.10%
1972 19.70%
1973 3.30%
1974 6.30%
1975 3.50%
1976 6.70%
1977 0.00%
1978 3.50%
1979 0.00%
1980 13.20%
1981 6.20%
1982 12.80%
1983 6.70%
1984 15.80%
1985 3.20%
1986 6.80%
1987 6.80%
1988 15.50%
1989 23.00%
1990 6.10%
1991 9.20%
1992 6.40%
1993 16.40%
1994 17.30%
1995 12.50%
1996 10.00%
1997 20.20%
1998 16.40%
1999 16.50%
2000 13.30%
2001 6.50%
2002 3.50%
2003 13.00%
2004 6.50%
2005 15.50%
2006 25.10%
2007 23.20%
2008 26.50%
2009 7.60%
2010 21.90%
2011 14.40%
2012 7.90%

*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.