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 24.40%
1911 24.78%
1912 11.44%
1913 20.06%
1914 13.36%
1915 17.80%
1916 34.04%
1917 29.58%
1918 17.26%
1919 3.84%
1920 13.26%
1921 42.94%
1922 13.34%
1923 39.64%
1924 30.12%
1925 15.60%
1926 46.40%
1927 5.18%
1928 24.00%
1929 10.26%
1930 9.36%
1931 17.20%
1932 24.30%
1933 9.64%
1934 13.20%
1935 6.92%
1936 20.90%
1937 9.12%
1938 3.46%
1939 12.18%
1940 35.24%
1941 23.84%
1942 35.80%
1943 26.56%
1944 3.68%
1945 45.06%
1946 21.26%
1947 19.98%
1948 12.44%
1949 3.68%
1950 36.28%
1951 11.12%
1952 16.04%
1953 28.88%
1954 16.52%
1955 15.24%
1956 43.18%
1957 11.90%
1958 11.02%
1959 3.28%
1960 8.76%
1961 11.74%
1962 13.70%
1963 6.40%
1964 11.04%
1965 16.12%
1966 10.12%
1967 30.50%
1968 8.74%
1969 7.86%
1970 4.76%
1971 22.94%
1972 8.94%
1973 50.74%
1974 18.06%
1975 7.96%
1976 13.18%
1977 49.60%
1978 5.22%
1979 14.64%
1980 8.30%
1981 7.48%
1982 5.30%
1983 26.96%
1984 44.36%
1985 29.02%
1986 25.18%
1987 23.78%
1988 3.70%
1989 11.62%
1990 14.76%
1991 48.54%
1992 10.10%
1993 14.76%
1994 4.28%
1995 3.58%
1996 13.86%
1997 22.08%
1998 41.60%
1999 15.68%
2000 44.74%
2001 12.32%
2002 18.70%
2003 10.22%
2004 28.14%
2005 16.68%
2006 26.06%
2007 23.46%
2008 19.86%
2009 13.54%
2010 60.20%
2011 51.96%
2012 52.48%
2013 8.18%
2014 26.18%

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.