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.

Download: Warm Data | Cold Data
Year Warm Cold
1910 0.00% 15.00%
1911 7.60% 0.00%
1912 0.00% 63.30%
1913 0.00% 26.60%
1914 0.00% 16.40%
1915 0.00% 24.50%
1916 4.70% 0.00%
1917 14.50% 0.00%
1918 0.00% 9.70%
1919 2.50% 0.00%
1920 0.00% 2.50%
1921 7.30% 0.00%
1922 4.70% 0.00%
1923 0.00% 60.30%
1924 0.00% 66.00%
1925 0.00% 7.20%
1926 0.00% 40.80%
1927 0.00% 92.80%
1928 2.40% 0.00%
1929 0.00% 81.20%
1930 6.90% 5.00%
1931 9.80% 0.00%
1932 2.30% 2.40%
1933 0.00% 0.00%
1934 9.90% 2.30%
1935 4.70% 0.00%
1936 0.00% 2.40%
1937 43.30% 0.00%
1938 9.40% 0.00%
1939 0.00% 0.00%
1940 0.00% 7.50%
1941 0.00% 2.50%
1942 0.00% 0.00%
1943 22.40% 0.00%
1944 0.00% 0.00%
1945 2.30% 0.00%
1946 0.00% 73.70%
1947 14.50% 0.00%
1948 0.00% 0.00%
1949 71.00% 0.00%
1950 0.00% 24.90%
1951 0.00% 4.80%
1952 2.50% 0.00%
1953 0.00% 2.50%
1954 0.00% 7.50%
1955 46.10% 0.00%
1956 0.00% 9.40%
1957 0.00% 4.70%
1958 0.00% 19.40%
1959 41.10% 0.00%
1960 0.00% 4.90%
1961 0.00% 0.00%
1962 0.00% 24.30%
1963 0.00% 37.40%
1964 0.00% 26.70%
1965 0.00% 80.60%
1966 0.00% 7.30%
1967 9.40% 0.00%
1968 0.00% 4.70%
1969 0.00% 0.00%
1970 0.00% 0.00%
1971 0.00% 7.50%
1972 0.00% 0.00%
1973 85.10% 0.00%
1974 0.00% 0.00%
1975 5.00% 0.00%
1976 0.00% 2.50%
1977 0.00% 2.50%
1978 0.00% 0.00%
1979 0.00% 0.00%
1980 0.00% 0.00%
1981 2.50% 0.00%
1982 0.00% 51.00%
1983 0.00% 0.00%
1984 2.30% 0.00%
1985 0.00% 19.70%
1986 0.00% 4.60%
1987 19.90% 0.00%
1988 0.00% 2.50%
1989 5.10% 0.00%
1990 7.10% 0.00%
1991 9.90% 0.00%
1992 0.00% 31.70%
1993 2.40% 0.00%
1994 17.00% 0.00%
1995 54.30% 0.00%
1996 2.40% 0.00%
1997 0.00% 9.90%
1998 4.80% 0.00%
1999 16.70% 0.00%
2000 0.00% 2.30%
2001 0.00% 0.00%
2002 37.40% 0.00%
2003 24.10% 0.00%
2004 0.00% 2.30%
2005 93.10% 0.00%
2006 66.00% 0.00%
2007 0.00% 0.00%
2008 19.10% 0.00%
2009 0.00% 0.00%
2010 85.70% 0.00%
2011 80.90% 0.00%
2012 56.10% 0.00%
2013 54.10% 0.00%
2014 2.30% 0.00%

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.