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 36.12%
1911 22.94%
1912 28.50%
1913 16.92%
1914 12.60%
1915 49.60%
1916 8.98%
1917 30.10%
1918 17.58%
1919 11.70%
1920 8.76%
1921 36.38%
1922 8.20%
1923 12.10%
1924 40.40%
1925 9.56%
1926 17.78%
1927 32.64%
1928 15.94%
1929 10.82%
1930 20.74%
1931 36.76%
1932 10.30%
1933 41.54%
1934 37.58%
1935 11.70%
1936 41.72%
1937 26.98%
1938 9.14%
1939 6.76%
1940 15.62%
1941 7.72%
1942 9.48%
1943 13.60%
1944 12.54%
1945 27.36%
1946 9.84%
1947 10.26%
1948 6.24%
1949 23.60%
1950 31.86%
1951 35.52%
1952 17.22%
1953 18.32%
1954 11.08%
1955 28.86%
1956 13.18%
1957 9.84%
1958 25.82%
1959 15.72%
1960 8.52%
1961 14.80%
1962 5.98%
1963 14.10%
1964 10.12%
1965 6.52%
1966 8.98%
1967 16.32%
1968 17.16%
1969 9.36%
1970 11.32%
1971 8.70%
1972 11.62%
1973 14.44%
1974 6.92%
1975 9.76%
1976 28.36%
1977 12.96%
1978 11.62%
1979 13.36%
1980 13.58%
1981 11.58%
1982 17.46%
1983 45.08%
1984 9.60%
1985 25.82%
1986 10.04%
1987 21.26%
1988 55.82%
1989 13.30%
1990 11.82%
1991 23.22%
1992 43.48%
1993 44.64%
1994 18.00%
1995 26.10%
1996 14.24%
1997 5.66%
1998 14.48%
1999 19.04%
2000 15.06%
2001 5.40%
2002 27.96%
2003 2.80%
2004 38.20%
2005 26.24%
2006 18.24%
2007 22.76%
2008 16.48%
2009 38.62%
2010 48.80%
2011 26.88%
2012 39.38%
2013 17.60%

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.