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 15.12%
1911 27.58%
1912 31.80%
1913 18.02%
1914 15.13%
1915 27.68%
1916 31.62%
1917 26.58%
1918 17.83%
1919 16.28%
1920 21.20%
1921 24.15%
1922 14.73%
1923 12.45%
1924 24.02%
1925 17.38%
1926 21.70%
1927 15.83%
1928 13.83%
1929 23.32%
1930 10.13%
1931 23.68%
1932 17.38%
1933 21.35%
1934 39.78%
1935 10.43%
1936 21.85%
1937 18.73%
1938 16.28%
1939 13.73%
1940 30.98%
1941 20.12%
1942 19.68%
1943 16.97%
1944 15.93%
1945 13.23%
1946 11.57%
1947 10.82%
1948 14.38%
1949 24.33%
1950 21.65%
1951 15.53%
1952 16.85%
1953 18.88%
1954 25.27%
1955 24.87%
1956 12.78%
1957 19.98%
1958 19.83%
1959 12.87%
1960 17.78%
1961 15.33%
1962 6.48%
1963 10.37%
1964 20.15%
1965 14.92%
1966 16.13%
1967 7.17%
1968 13.88%
1969 18.58%
1970 16.33%
1971 14.35%
1972 14.85%
1973 21.72%
1974 13.20%
1975 17.77%
1976 14.25%
1977 9.90%
1978 24.82%
1979 30.13%
1980 13.00%
1981 18.40%
1982 15.07%
1983 27.22%
1984 15.43%
1985 15.30%
1986 21.35%
1987 17.48%
1988 19.65%
1989 13.70%
1990 17.53%
1991 27.55%
1992 31.52%
1993 26.65%
1994 17.55%
1995 20.78%
1996 22.80%
1997 17.80%
1998 31.93%
1999 24.85%
2000 26.42%
2001 15.43%
2002 20.92%
2003 24.90%
2004 23.92%
2005 32.72%
2006 35.63%
2007 29.03%
2008 22.48%
2009 13.48%
2010 19.58%
2011 36.22%
2012 42.30%
2013 19.67%
2014 29.70%

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.