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% 6.90%
1911 1.70% 3.20%
1912 15.00% 0.00%
1913 1.60% 0.00%
1914 0.00% 11.40%
1915 0.00% 26.10%
1916 0.00% 6.90%
1917 0.00% 16.00%
1918 38.60% 0.00%
1919 0.00% 0.00%
1920 0.00% 18.80%
1921 54.30% 0.00%
1922 49.90% 0.00%
1923 0.00% 3.10%
1924 0.00% 42.70%
1925 0.00% 1.60%
1926 0.00% 86.70%
1927 32.40% 0.00%
1928 0.00% 9.50%
1929 71.60% 0.00%
1930 0.00% 0.00%
1931 0.00% 73.20%
1932 0.00% 20.50%
1933 1.70% 0.00%
1934 0.00% 4.60%
1935 55.40% 0.00%
1936 1.70% 0.00%
1937 0.00% 7.90%
1938 50.00% 0.00%
1939 0.00% 0.00%
1940 0.00% 56.60%
1941 0.00% 30.70%
1942 0.00% 3.40%
1943 0.00% 3.20%
1944 0.00% 0.00%
1945 64.90% 0.00%
1946 46.50% 0.00%
1947 0.00% 23.60%
1948 63.60% 0.00%
1949 0.00% 0.00%
1950 0.00% 8.00%
1951 0.00% 1.70%
1952 0.00% 1.60%
1953 23.50% 0.00%
1954 0.00% 0.00%
1955 47.90% 0.00%
1956 0.00% 1.50%
1957 6.40% 0.00%
1958 0.00% 0.00%
1959 0.00% 0.00%
1960 0.00% 91.60%
1961 0.00% 14.50%
1962 0.00% 0.00%
1963 8.20% 0.00%
1964 0.00% 0.00%
1965 1.60% 0.00%
1966 0.00% 1.60%
1967 3.30% 1.60%
1968 0.00% 8.20%
1969 0.00% 48.40%
1970 0.00% 0.00%
1971 0.00% 100.00%
1972 0.00% 1.50%
1973 4.60% 0.00%
1974 3.10% 0.00%
1975 0.00% 0.00%
1976 0.00% 3.10%
1977 28.30% 0.00%
1978 0.00% 0.00%
1979 0.00% 0.00%
1980 0.00% 4.70%
1981 0.00% 9.70%
1982 0.00% 0.00%
1983 0.00% 39.50%
1984 0.00% 8.00%
1985 4.90% 0.00%
1986 0.00% 10.10%
1987 0.00% 0.00%
1988 0.00% 25.70%
1989 1.70% 0.00%
1990 3.30% 0.00%
1991 95.20% 0.00%
1992 0.00% 22.90%
1993 0.00% 42.60%
1994 5.10% 1.60%
1995 20.00% 1.50%
1996 0.00% 9.70%
1997 11.90% 9.40%
1998 12.50% 0.00%
1999 0.00% 0.00%
2000 4.60% 0.00%
2001 0.00% 0.00%
2002 13.40% 1.50%
2003 55.60% 0.00%
2004 40.80% 0.00%
2005 0.00% 24.40%
2006 3.20% 0.00%
2007 0.00% 1.70%
2008 0.00% 0.00%
2009 3.10% 0.00%
2010 20.20% 0.00%
2011 19.00% 0.00%
2012 100.00% 0.00%
2013 0.00% 27.90%
2014 0.00% 3.10%

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.