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 15.76%
1911 11.30%
1912 36.96%
1913 8.54%
1914 18.38%
1915 9.76%
1916 12.12%
1917 40.20%
1918 10.90%
1919 7.98%
1920 12.58%
1921 41.18%
1922 14.94%
1923 6.38%
1924 34.60%
1925 9.36%
1926 18.46%
1927 26.60%
1928 10.86%
1929 30.20%
1930 18.04%
1931 49.74%
1932 5.58%
1933 22.00%
1934 27.10%
1935 7.88%
1936 19.64%
1937 12.74%
1938 31.12%
1939 18.54%
1940 31.16%
1941 25.22%
1942 9.40%
1943 7.98%
1944 11.34%
1945 14.44%
1946 22.58%
1947 4.38%
1948 4.12%
1949 12.48%
1950 42.10%
1951 26.32%
1952 6.68%
1953 41.70%
1954 37.30%
1955 11.92%
1956 13.42%
1957 9.36%
1958 35.62%
1959 5.20%
1960 16.54%
1961 9.12%
1962 5.92%
1963 34.14%
1964 18.84%
1965 7.38%
1966 18.06%
1967 4.08%
1968 8.02%
1969 15.38%
1970 8.70%
1971 6.74%
1972 18.16%
1973 40.40%
1974 19.32%
1975 14.86%
1976 32.64%
1977 8.32%
1978 34.76%
1979 47.90%
1980 11.10%
1981 10.80%
1982 16.38%
1983 10.84%
1984 8.00%
1985 20.22%
1986 14.78%
1987 18.64%
1988 24.44%
1989 26.28%
1990 37.72%
1991 24.34%
1992 8.84%
1993 35.78%
1994 15.12%
1995 8.50%
1996 35.08%
1997 15.18%
1998 45.64%
1999 29.08%
2000 16.54%
2001 11.40%
2002 24.74%
2003 21.72%
2004 24.64%
2005 15.06%
2006 30.38%
2007 28.28%
2008 32.56%
2009 25.80%
2010 21.22%
2011 32.74%
2012 50.98%
2013 19.54%

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.