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 21.76%
1911 17.18%
1912 24.42%
1913 18.78%
1914 19.48%
1915 37.20%
1916 18.02%
1917 22.34%
1918 17.14%
1919 23.00%
1920 18.74%
1921 18.96%
1922 12.34%
1923 17.06%
1924 24.16%
1925 16.88%
1926 13.32%
1927 25.68%
1928 21.32%
1929 15.44%
1930 19.64%
1931 24.32%
1932 10.72%
1933 19.48%
1934 34.54%
1935 9.60%
1936 36.02%
1937 15.00%
1938 9.78%
1939 10.12%
1940 17.62%
1941 22.66%
1942 12.70%
1943 19.92%
1944 17.62%
1945 17.72%
1946 11.86%
1947 14.18%
1948 10.84%
1949 17.32%
1950 25.28%
1951 22.00%
1952 17.92%
1953 18.74%
1954 28.20%
1955 14.92%
1956 14.90%
1957 10.82%
1958 19.86%
1959 11.30%
1960 10.72%
1961 25.16%
1962 9.46%
1963 14.24%
1964 13.16%
1965 19.46%
1966 11.60%
1967 24.78%
1968 11.32%
1969 6.28%
1970 10.68%
1971 7.86%
1972 15.64%
1973 16.74%
1974 13.20%
1975 15.32%
1976 23.48%
1977 11.42%
1978 11.12%
1979 14.62%
1980 25.88%
1981 14.14%
1982 13.72%
1983 26.38%
1984 15.80%
1985 15.22%
1986 11.22%
1987 13.30%
1988 27.24%
1989 18.22%
1990 11.18%
1991 15.82%
1992 35.00%
1993 31.92%
1994 17.94%
1995 21.16%
1996 16.42%
1997 14.24%
1998 22.08%
1999 16.32%
2000 18.52%
2001 15.98%
2002 26.18%
2003 25.20%
2004 26.38%
2005 19.94%
2006 27.78%
2007 33.60%
2008 16.02%
2009 19.86%
2010 27.56%
2011 39.48%
2012 32.54%
2013 28.00%
2014 19.98%

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.