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 47.30% 0.00%
1911 31.20% 0.00%
1912 0.00% 42.90%
1913 0.90% 0.00%
1914 0.00% 11.80%
1915 0.00% 79.80%
1916 6.80% 0.00%
1917 0.00% 9.20%
1918 24.80% 0.00%
1919 0.00% 12.50%
1920 0.00% 5.70%
1921 23.30% 0.00%
1922 1.00% 0.90%
1923 0.00% 8.70%
1924 0.00% 79.20%
1925 70.00% 0.00%
1926 0.00% 58.60%
1927 10.60% 0.00%
1928 0.00% 0.00%
1929 1.00% 1.00%
1930 0.00% 1.00%
1931 0.00% 79.80%
1932 0.00% 4.90%
1933 9.80% 0.00%
1934 20.90% 0.00%
1935 1.00% 1.90%
1936 36.20% 0.00%
1937 0.00% 0.00%
1938 19.00% 0.00%
1939 12.60% 0.00%
1940 1.00% 0.00%
1941 0.00% 31.00%
1942 0.00% 1.00%
1943 1.00% 0.00%
1944 0.00% 11.60%
1945 3.00% 0.00%
1946 21.00% 0.00%
1947 0.00% 49.40%
1948 5.90% 0.00%
1949 0.00% 1.00%
1950 0.90% 0.90%
1951 0.00% 2.70%
1952 0.00% 3.60%
1953 2.90% 0.00%
1954 0.00% 0.00%
1955 38.30% 0.00%
1956 17.60% 0.00%
1957 0.00% 49.60%
1958 0.00% 82.60%
1959 0.00% 0.00%
1960 0.00% 42.20%
1961 1.00% 0.90%
1962 0.00% 0.00%
1963 74.80% 0.00%
1964 0.90% 0.00%
1965 0.00% 8.70%
1966 0.00% 0.00%
1967 62.20% 0.00%
1968 0.00% 13.70%
1969 0.00% 37.60%
1970 0.00% 5.90%
1971 0.90% 5.80%
1972 41.40% 0.00%
1973 0.00% 13.20%
1974 56.70% 0.00%
1975 0.00% 4.80%
1976 0.00% 0.00%
1977 27.00% 0.00%
1978 2.90% 0.00%
1979 0.00% 0.00%
1980 0.00% 13.30%
1981 0.00% 1.00%
1982 0.00% 0.00%
1983 0.00% 69.90%
1984 4.00% 24.50%
1985 11.00% 0.00%
1986 31.30% 0.00%
1987 17.60% 6.90%
1988 0.90% 0.00%
1989 17.00% 0.90%
1990 0.00% 0.00%
1991 13.00% 0.00%
1992 2.70% 1.00%
1993 0.00% 49.10%
1994 5.30% 0.00%
1995 0.00% 15.30%
1996 2.90% 0.00%
1997 0.00% 4.90%
1998 0.00% 0.00%
1999 1.00% 0.00%
2000 28.80% 0.00%
2001 0.00% 0.00%
2002 3.90% 0.00%
2003 6.70% 0.00%
2004 14.40% 0.00%
2005 0.00% 0.00%
2006 91.60% 0.00%
2007 10.30% 0.00%
2008 4.00% 0.00%
2009 2.00% 0.90%
2010 2.90% 1.00%
2011 50.20% 0.00%
2012 96.10% 0.00%
2013 0.00% 31.90%
2014 0.00% 8.70%

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.