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 16.62%
1911 28.03%
1912 32.55%
1913 16.80%
1914 15.77%
1915 30.05%
1916 28.60%
1917 26.05%
1918 17.93%
1919 21.52%
1920 20.22%
1921 22.78%
1922 14.12%
1923 12.18%
1924 28.52%
1925 17.47%
1926 23.28%
1927 15.58%
1928 17.52%
1929 24.57%
1930 9.92%
1931 22.85%
1932 16.92%
1933 30.62%
1934 35.25%
1935 14.75%
1936 18.72%
1937 14.33%
1938 17.50%
1939 13.30%
1940 27.47%
1941 22.37%
1942 18.12%
1943 12.95%
1944 13.78%
1945 16.70%
1946 8.93%
1947 15.30%
1948 16.33%
1949 19.08%
1950 24.70%
1951 16.72%
1952 12.97%
1953 19.42%
1954 28.05%
1955 24.48%
1956 14.72%
1957 16.40%
1958 20.03%
1959 12.88%
1960 21.57%
1961 17.57%
1962 6.57%
1963 11.83%
1964 21.47%
1965 27.33%
1966 14.48%
1967 12.65%
1968 13.08%
1969 15.12%
1970 13.60%
1971 14.92%
1972 12.38%
1973 21.75%
1974 14.12%
1975 19.65%
1976 12.55%
1977 9.65%
1978 21.60%
1979 32.72%
1980 12.35%
1981 16.50%
1982 15.58%
1983 24.47%
1984 16.45%
1985 19.67%
1986 18.17%
1987 17.15%
1988 19.13%
1989 16.53%
1990 20.35%
1991 21.23%
1992 26.68%
1993 23.93%
1994 16.30%
1995 17.55%
1996 23.80%
1997 16.80%
1998 39.15%
1999 23.62%
2000 25.88%
2001 14.52%
2002 23.40%
2003 24.87%
2004 29.68%
2005 32.93%
2006 28.88%
2007 27.98%
2008 24.70%
2009 12.47%
2010 20.42%
2011 30.90%
2012 38.95%
2013 18.32%
2014 26.68%

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.