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 17.98%
1911 35.70%
1912 16.88%
1913 12.86%
1914 15.40%
1915 16.06%
1916 35.14%
1917 21.56%
1918 6.72%
1919 20.12%
1920 15.94%
1921 4.46%
1922 31.02%
1923 20.22%
1924 38.12%
1925 5.16%
1926 33.66%
1927 11.90%
1928 10.46%
1929 27.08%
1930 13.08%
1931 13.06%
1932 12.16%
1933 19.80%
1934 31.90%
1935 3.30%
1936 21.68%
1937 8.22%
1938 23.88%
1939 25.20%
1940 24.50%
1941 47.12%
1942 9.22%
1943 7.06%
1944 12.88%
1945 8.24%
1946 14.42%
1947 9.90%
1948 28.76%
1949 14.90%
1950 15.38%
1951 13.60%
1952 21.90%
1953 11.68%
1954 22.98%
1955 27.16%
1956 11.98%
1957 17.70%
1958 26.20%
1959 62.20%
1960 12.34%
1961 8.10%
1962 25.60%
1963 8.44%
1964 4.06%
1965 15.04%
1966 16.70%
1967 1.08%
1968 0.00%
1969 19.78%
1970 11.94%
1971 19.92%
1972 3.74%
1973 13.84%
1974 14.42%
1975 14.90%
1976 16.88%
1977 13.40%
1978 17.00%
1979 11.64%
1980 13.74%
1981 25.92%
1982 44.66%
1983 65.94%
1984 18.08%
1985 4.92%
1986 25.36%
1987 11.16%
1988 9.72%
1989 9.72%
1990 21.82%
1991 7.30%
1992 32.12%
1993 6.72%
1994 0.00%
1995 40.52%
1996 61.22%
1997 41.56%
1998 51.56%
1999 2.22%
2000 10.62%
2001 23.98%
2002 24.58%
2003 31.48%
2004 28.76%
2005 41.50%
2006 19.16%
2007 38.96%
2008 27.62%
2009 5.08%
2010 20.50%
2011 6.94%
2012 46.02%
2013 37.10%

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.