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 42.50%
1911 17.70%
1912 33.16%
1913 21.12%
1914 9.90%
1915 11.08%
1916 39.70%
1917 19.78%
1918 8.68%
1919 39.06%
1920 4.54%
1921 10.82%
1922 25.88%
1923 12.04%
1924 29.84%
1925 11.20%
1926 31.54%
1927 12.20%
1928 4.56%
1929 11.54%
1930 21.00%
1931 29.12%
1932 10.10%
1933 11.60%
1934 28.06%
1935 15.22%
1936 14.98%
1937 16.56%
1938 14.02%
1939 13.68%
1940 25.18%
1941 25.80%
1942 8.26%
1943 16.00%
1944 18.46%
1945 14.54%
1946 6.42%
1947 20.20%
1948 25.46%
1949 15.14%
1950 6.84%
1951 22.36%
1952 2.30%
1953 21.56%
1954 40.22%
1955 11.38%
1956 8.72%
1957 14.34%
1958 35.72%
1959 4.06%
1960 8.78%
1961 32.42%
1962 10.42%
1963 17.02%
1964 23.72%
1965 13.88%
1966 12.84%
1967 39.92%
1968 9.98%
1969 7.66%
1970 14.54%
1971 9.54%
1972 11.20%
1973 15.66%
1974 6.82%
1975 11.68%
1976 32.40%
1977 26.34%
1978 13.28%
1979 3.60%
1980 27.16%
1981 4.14%
1982 16.50%
1983 44.52%
1984 27.94%
1985 14.04%
1986 5.84%
1987 8.64%
1988 13.96%
1989 2.20%
1990 21.44%
1991 9.82%
1992 39.62%
1993 53.02%
1994 12.94%
1995 27.84%
1996 19.28%
1997 19.52%
1998 32.20%
1999 8.04%
2000 9.84%
2001 14.92%
2002 11.50%
2003 41.36%
2004 28.10%
2005 6.20%
2006 18.02%
2007 23.32%
2008 6.56%
2009 21.10%
2010 13.12%
2011 13.52%
2012 11.10%
2013 34.08%
2014 32.00%

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.