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 20.13%
1911 24.25%
1912 32.83%
1913 16.20%
1914 14.90%
1915 25.93%
1916 31.90%
1917 27.43%
1918 12.82%
1919 20.28%
1920 19.00%
1921 24.95%
1922 13.90%
1923 16.58%
1924 25.90%
1925 12.67%
1926 23.72%
1927 17.80%
1928 15.13%
1929 28.22%
1930 10.28%
1931 23.17%
1932 15.02%
1933 26.28%
1934 36.70%
1935 16.20%
1936 20.15%
1937 12.27%
1938 18.23%
1939 15.32%
1940 24.43%
1941 28.98%
1942 14.42%
1943 12.45%
1944 15.57%
1945 15.32%
1946 12.63%
1947 17.47%
1948 18.25%
1949 18.08%
1950 27.35%
1951 17.88%
1952 13.47%
1953 21.78%
1954 31.45%
1955 21.88%
1956 14.83%
1957 19.42%
1958 17.27%
1959 16.70%
1960 16.43%
1961 15.32%
1962 5.88%
1963 14.62%
1964 24.98%
1965 20.90%
1966 16.65%
1967 12.92%
1968 14.07%
1969 16.08%
1970 13.77%
1971 12.23%
1972 12.77%
1973 19.32%
1974 11.32%
1975 19.95%
1976 17.07%
1977 9.60%
1978 16.83%
1979 30.67%
1980 10.03%
1981 16.33%
1982 17.33%
1983 25.88%
1984 14.48%
1985 25.58%
1986 17.78%
1987 18.05%
1988 17.48%
1989 17.92%
1990 21.17%
1991 17.83%
1992 26.30%
1993 23.87%
1994 12.75%
1995 20.23%
1996 28.23%
1997 16.78%
1998 43.35%
1999 28.27%
2000 19.07%
2001 17.05%
2002 23.87%
2003 25.03%
2004 30.05%
2005 36.02%
2006 27.18%
2007 29.52%
2008 24.08%
2009 14.23%
2010 19.52%
2011 27.80%
2012 40.30%
2013 17.45%
2014 29.12%

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.