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 19.72%
1911 26.75%
1912 34.17%
1913 19.90%
1914 14.32%
1915 28.32%
1916 31.32%
1917 28.87%
1918 14.47%
1919 20.52%
1920 17.03%
1921 25.42%
1922 14.05%
1923 17.55%
1924 27.68%
1925 13.40%
1926 22.82%
1927 14.87%
1928 14.97%
1929 23.18%
1930 10.50%
1931 22.95%
1932 16.58%
1933 26.55%
1934 37.93%
1935 14.27%
1936 18.38%
1937 13.23%
1938 19.23%
1939 14.05%
1940 26.25%
1941 28.40%
1942 15.85%
1943 11.68%
1944 15.72%
1945 14.45%
1946 10.95%
1947 17.30%
1948 17.98%
1949 25.38%
1950 26.43%
1951 17.72%
1952 12.07%
1953 21.02%
1954 31.47%
1955 22.18%
1956 15.78%
1957 17.68%
1958 19.60%
1959 14.40%
1960 18.10%
1961 16.33%
1962 7.65%
1963 15.37%
1964 26.32%
1965 22.62%
1966 18.98%
1967 11.68%
1968 13.45%
1969 15.73%
1970 12.50%
1971 13.32%
1972 12.62%
1973 20.10%
1974 11.90%
1975 19.78%
1976 13.85%
1977 9.23%
1978 20.40%
1979 29.57%
1980 10.88%
1981 13.53%
1982 17.08%
1983 24.68%
1984 15.55%
1985 20.60%
1986 18.22%
1987 15.72%
1988 20.63%
1989 17.50%
1990 17.78%
1991 20.40%
1992 25.42%
1993 22.60%
1994 15.10%
1995 19.57%
1996 23.02%
1997 16.63%
1998 40.77%
1999 21.42%
2000 26.63%
2001 15.30%
2002 23.80%
2003 27.83%
2004 28.32%
2005 34.15%
2006 24.70%
2007 28.12%
2008 24.47%
2009 15.10%
2010 20.10%
2011 29.50%
2012 39.80%
2013 17.45%
2014 27.92%

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.