U.S. Climate Extremes Index (CEI)

NCDC transitioned to the nClimDiv dataset on Thursday, March 13, 2014. This was coincident with the release of the February 2014 monthly monitoring report. For details on this transition, please visit our public FTP site and our U.S. Climate Divisional Database site.

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 9.80%
1911 35.50%
1912 55.40%
1913 20.30%
1914 5.50%
1915 26.60%
1916 25.10%
1917 52.40%
1918 3.80%
1919 14.30%
1920 24.90%
1921 42.60%
1922 22.70%
1923 7.10%
1924 40.30%
1925 32.60%
1926 30.80%
1927 10.30%
1928 4.30%
1929 30.60%
1930 2.90%
1931 25.60%
1932 13.80%
1933 37.30%
1934 58.20%
1935 2.60%
1936 13.40%
1937 32.10%
1938 11.50%
1939 6.10%
1940 52.10%
1941 17.10%
1942 8.90%
1943 8.00%
1944 16.50%
1945 7.30%
1946 24.90%
1947 16.20%
1948 5.20%
1949 31.80%
1950 29.10%
1951 7.60%
1952 17.70%
1953 24.70%
1954 21.20%
1955 19.70%
1956 1.50%
1957 7.60%
1958 42.10%
1959 3.10%
1960 30.00%
1961 11.40%
1962 0.60%
1963 1.80%
1964 12.50%
1965 9.80%
1966 12.30%
1967 9.30%
1968 7.50%
1969 11.70%
1970 5.40%
1971 4.90%
1972 14.10%
1973 18.40%
1974 9.20%
1975 25.50%
1976 9.20%
1977 5.10%
1978 47.30%
1979 56.90%
1980 9.40%
1981 25.00%
1982 16.50%
1983 29.60%
1984 9.30%
1985 1.60%
1986 36.50%
1987 42.10%
1988 12.00%
1989 6.80%
1990 25.80%
1991 19.30%
1992 29.20%
1993 22.40%
1994 17.00%
1995 1.50%
1996 17.90%
1997 6.50%
1998 24.30%
1999 12.00%
2000 59.20%
2001 3.10%
2002 21.00%
2003 12.00%
2004 9.90%
2005 4.50%
2006 61.80%
2007 20.70%
2008 6.60%
2009 7.90%
2010 11.90%
2011 20.90%
2012 83.40%
2013 8.30%
2014 32.40%

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.