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 15.30% 3.70%
1911 10.70% 17.40%
1912 0.00% 53.90%
1913 6.00% 24.00%
1914 0.60% 6.50%
1915 0.70% 22.90%
1916 1.40% 27.40%
1917 1.30% 37.30%
1918 0.90% 4.90%
1919 1.10% 19.90%
1920 0.30% 30.80%
1921 45.90% 0.50%
1922 4.50% 12.60%
1923 0.00% 17.40%
1924 1.80% 29.90%
1925 13.30% 1.40%
1926 11.40% 16.70%
1927 10.10% 10.80%
1928 1.30% 1.90%
1929 1.20% 25.50%
1930 4.40% 5.10%
1931 38.50% 2.10%
1932 2.60% 7.70%
1933 33.10% 1.80%
1934 61.70% 0.40%
1935 0.60% 3.80%
1936 7.10% 1.60%
1937 0.80% 2.40%
1938 25.80% 2.20%
1939 42.70% 0.00%
1940 9.30% 22.50%
1941 4.10% 13.40%
1942 0.10% 1.40%
1943 4.90% 2.80%
1944 0.20% 7.80%
1945 0.90% 2.40%
1946 21.50% 0.40%
1947 0.10% 0.70%
1948 0.90% 10.50%
1949 9.40% 2.40%
1950 8.80% 20.50%
1951 2.30% 27.20%
1952 4.10% 2.30%
1953 31.50% 0.20%
1954 42.00% 2.00%
1955 0.60% 12.80%
1956 14.90% 0.70%
1957 0.30% 8.10%
1958 11.70% 30.40%
1959 6.60% 1.50%
1960 0.50% 16.10%
1961 0.70% 7.40%
1962 0.00% 2.30%
1963 6.70% 4.20%
1964 0.60% 10.70%
1965 0.00% 10.00%
1966 1.10% 11.70%
1967 2.60% 1.50%
1968 0.00% 15.60%
1969 0.00% 16.90%
1970 0.40% 0.90%
1971 0.00% 6.40%
1972 0.00% 20.90%
1973 0.10% 6.10%
1974 1.00% 0.30%
1975 0.50% 16.50%
1976 3.20% 9.90%
1977 3.00% 0.20%
1978 0.00% 27.60%
1979 0.00% 40.70%
1980 0.90% 2.30%
1981 19.00% 0.90%
1982 0.00% 25.50%
1983 0.00% 25.50%
1984 1.30% 11.90%
1985 0.00% 17.80%
1986 4.20% 0.20%
1987 29.30% 2.30%
1988 17.50% 0.50%
1989 7.00% 11.50%
1990 24.00% 0.00%
1991 9.50% 1.60%
1992 17.30% 9.30%
1993 0.00% 38.30%
1994 11.30% 0.20%
1995 3.10% 0.20%
1996 10.80% 24.80%
1997 3.30% 9.90%
1998 34.00% 5.40%
1999 48.90% 0.00%
2000 17.60% 0.00%
2001 24.80% 0.10%
2002 16.80% 0.20%
2003 27.90% 1.30%
2004 5.10% 0.00%
2005 10.30% 0.20%
2006 51.30% 0.30%
2007 33.40% 0.70%
2008 5.10% 4.10%
2009 4.70% 3.10%
2010 6.50% 1.70%
2011 22.80% 1.40%
2012 84.60% 0.00%
2013 6.20% 8.60%

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.