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 46.50% 0.00%
1911 0.00% 70.80%
1912 0.00% 7.90%
1913 0.00% 4.00%
1914 13.40% 0.00%
1915 41.60% 0.00%
1916 0.00% 4.00%
1917 0.00% 60.00%
1918 0.00% 31.30%
1919 0.00% 7.60%
1920 0.00% 59.70%
1921 4.00% 1.80%
1922 0.00% 78.50%
1923 2.00% 2.00%
1924 0.00% 9.80%
1925 17.50% 0.00%
1926 27.10% 0.00%
1927 0.00% 19.00%
1928 2.00% 0.00%
1929 2.00% 5.90%
1930 7.90% 0.00%
1931 3.90% 0.00%
1932 12.00% 0.00%
1933 0.00% 19.60%
1934 96.10% 0.00%
1935 0.00% 53.30%
1936 15.40% 0.00%
1937 2.00% 0.00%
1938 0.00% 0.00%
1939 2.00% 0.00%
1940 65.10% 0.00%
1941 24.50% 0.00%
1942 0.00% 2.00%
1943 0.00% 7.30%
1944 0.00% 6.00%
1945 0.00% 2.00%
1946 0.00% 0.00%
1947 38.90% 0.00%
1948 0.00% 5.80%
1949 7.90% 0.00%
1950 0.00% 23.00%
1951 0.00% 44.90%
1952 0.00% 0.00%
1953 0.00% 6.00%
1954 0.00% 39.40%
1955 0.00% 96.10%
1956 0.00% 0.00%
1957 46.30% 0.00%
1958 0.00% 0.00%
1959 0.00% 7.90%
1960 0.00% 0.00%
1961 1.90% 0.00%
1962 0.00% 0.00%
1963 3.80% 0.00%
1964 0.00% 64.10%
1965 0.00% 18.80%
1966 0.00% 2.00%
1967 0.00% 19.50%
1968 0.00% 8.00%
1969 0.00% 0.00%
1970 0.00% 21.50%
1971 0.00% 9.50%
1972 0.00% 0.00%
1973 1.90% 0.00%
1974 1.90% 0.00%
1975 0.00% 47.90%
1976 0.00% 27.40%
1977 0.00% 6.00%
1978 2.00% 0.00%
1979 2.00% 0.00%
1980 9.50% 0.00%
1981 3.90% 0.00%
1982 0.00% 26.30%
1983 11.30% 0.00%
1984 1.90% 0.00%
1985 0.00% 0.00%
1986 19.40% 0.00%
1987 70.70% 0.00%
1988 0.00% 0.00%
1989 7.90% 0.00%
1990 11.30% 0.00%
1991 0.00% 0.00%
1992 86.40% 0.00%
1993 69.10% 0.00%
1994 59.30% 0.00%
1995 4.00% 0.00%
1996 2.00% 0.00%
1997 25.70% 0.00%
1998 24.10% 0.00%
1999 2.00% 19.20%
2000 9.90% 0.00%
2001 4.00% 0.00%
2002 0.00% 1.90%
2003 22.90% 0.00%
2004 38.10% 0.00%
2005 57.30% 0.00%
2006 3.90% 0.00%
2007 7.90% 0.00%
2008 0.00% 17.80%
2009 0.00% 7.40%
2010 0.00% 4.00%
2011 0.00% 3.90%
2012 3.90% 0.00%
2013 5.80% 0.00%
2014 36.80% 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.