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 21.90%
1911 23.43%
1912 31.10%
1913 17.22%
1914 15.90%
1915 26.33%
1916 33.93%
1917 27.93%
1918 11.65%
1919 21.60%
1920 17.68%
1921 25.95%
1922 15.20%
1923 17.13%
1924 28.03%
1925 13.05%
1926 22.92%
1927 16.95%
1928 15.27%
1929 25.18%
1930 11.72%
1931 24.50%
1932 17.08%
1933 29.40%
1934 35.75%
1935 15.65%
1936 19.00%
1937 12.35%
1938 18.03%
1939 17.75%
1940 22.15%
1941 32.03%
1942 13.45%
1943 10.73%
1944 15.13%
1945 14.42%
1946 13.95%
1947 16.98%
1948 19.93%
1949 18.80%
1950 28.28%
1951 20.57%
1952 12.93%
1953 23.13%
1954 31.15%
1955 21.83%
1956 16.53%
1957 17.35%
1958 19.93%
1959 15.78%
1960 19.17%
1961 15.42%
1962 6.53%
1963 14.88%
1964 24.83%
1965 19.23%
1966 16.10%
1967 10.55%
1968 14.30%
1969 15.85%
1970 10.83%
1971 13.13%
1972 14.05%
1973 18.08%
1974 11.57%
1975 16.93%
1976 20.30%
1977 8.53%
1978 16.88%
1979 27.38%
1980 10.77%
1981 17.93%
1982 16.12%
1983 25.98%
1984 14.63%
1985 28.17%
1986 17.60%
1987 18.45%
1988 15.58%
1989 22.03%
1990 20.33%
1991 19.67%
1992 25.10%
1993 22.28%
1994 13.10%
1995 20.85%
1996 31.50%
1997 17.37%
1998 43.23%
1999 29.37%
2000 15.70%
2001 20.08%
2002 22.62%
2003 25.15%
2004 30.02%
2005 34.33%
2006 29.08%
2007 28.23%
2008 25.80%
2009 13.73%
2010 20.12%
2011 26.53%
2012 41.82%
2013 18.63%

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.