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 18.62%
1911 29.88%
1912 34.04%
1913 19.32%
1914 18.94%
1915 22.06%
1916 23.28%
1917 31.20%
1918 16.46%
1919 16.90%
1920 22.92%
1921 26.26%
1922 19.76%
1923 13.08%
1924 28.82%
1925 22.22%
1926 23.12%
1927 18.94%
1928 11.38%
1929 29.10%
1930 10.68%
1931 26.20%
1932 11.88%
1933 18.68%
1934 40.78%
1935 11.98%
1936 18.42%
1937 21.46%
1938 15.12%
1939 10.66%
1940 31.54%
1941 23.78%
1942 16.44%
1943 13.30%
1944 14.62%
1945 10.78%
1946 14.20%
1947 14.42%
1948 14.30%
1949 23.66%
1950 22.08%
1951 16.28%
1952 15.58%
1953 18.36%
1954 25.32%
1955 21.96%
1956 13.72%
1957 15.60%
1958 25.22%
1959 8.88%
1960 17.76%
1961 16.08%
1962 7.78%
1963 11.56%
1964 18.22%
1965 14.56%
1966 12.80%
1967 8.92%
1968 11.58%
1969 11.88%
1970 11.52%
1971 12.94%
1972 14.64%
1973 25.36%
1974 16.02%
1975 19.16%
1976 11.26%
1977 12.98%
1978 28.48%
1979 32.90%
1980 10.84%
1981 19.16%
1982 16.34%
1983 26.86%
1984 19.08%
1985 14.32%
1986 24.60%
1987 22.42%
1988 20.38%
1989 13.72%
1990 23.08%
1991 23.44%
1992 25.90%
1993 24.90%
1994 14.52%
1995 16.14%
1996 25.06%
1997 18.40%
1998 33.22%
1999 23.60%
2000 30.52%
2001 13.14%
2002 23.04%
2003 21.58%
2004 15.30%
2005 16.98%
2006 39.42%
2007 25.14%
2008 17.92%
2009 14.72%
2010 22.18%
2011 32.88%
2012 46.02%
2013 21.38%
2014 31.48%

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.