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 51.04%
1911 24.32%
1912 31.10%
1913 12.10%
1914 11.28%
1915 21.88%
1916 21.62%
1917 46.58%
1918 9.86%
1919 12.30%
1920 33.56%
1921 8.12%
1922 13.54%
1923 15.16%
1924 26.76%
1925 17.50%
1926 16.10%
1927 19.16%
1928 21.00%
1929 17.04%
1930 8.10%
1931 7.96%
1932 6.74%
1933 6.44%
1934 55.44%
1935 32.12%
1936 14.18%
1937 17.92%
1938 13.76%
1939 18.86%
1940 16.34%
1941 17.84%
1942 14.10%
1943 15.26%
1944 13.88%
1945 10.78%
1946 26.16%
1947 13.98%
1948 11.18%
1949 8.70%
1950 30.66%
1951 29.86%
1952 14.84%
1953 7.74%
1954 14.26%
1955 32.36%
1956 12.58%
1957 14.58%
1958 10.66%
1959 7.28%
1960 13.90%
1961 16.36%
1962 9.68%
1963 3.80%
1964 13.34%
1965 33.64%
1966 9.32%
1967 13.28%
1968 2.78%
1969 10.58%
1970 18.30%
1971 7.96%
1972 11.80%
1973 16.14%
1974 8.76%
1975 32.74%
1976 8.52%
1977 29.14%
1978 8.72%
1979 12.04%
1980 18.02%
1981 33.28%
1982 9.72%
1983 20.14%
1984 14.02%
1985 31.20%
1986 24.46%
1987 40.96%
1988 24.68%
1989 17.06%
1990 13.52%
1991 20.62%
1992 34.22%
1993 12.22%
1994 32.62%
1995 28.22%
1996 35.98%
1997 13.66%
1998 9.98%
1999 19.00%
2000 22.28%
2001 21.90%
2002 31.56%
2003 8.70%
2004 34.00%
2005 13.16%
2006 11.98%
2007 40.08%
2008 15.54%
2009 11.92%
2010 24.16%
2011 40.92%
2012 38.48%
2013 32.94%
2014 10.62%

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.