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 6.40% 8.40%
1911 18.90% 18.50%
1912 0.40% 51.90%
1913 2.30% 16.80%
1914 3.60% 6.40%
1915 1.80% 7.40%
1916 0.80% 46.40%
1917 0.00% 71.20%
1918 1.90% 6.10%
1919 2.70% 15.30%
1920 0.40% 12.40%
1921 43.70% 0.40%
1922 11.30% 14.80%
1923 2.70% 9.00%
1924 0.00% 61.80%
1925 11.00% 0.60%
1926 7.30% 11.20%
1927 15.40% 4.30%
1928 1.70% 2.10%
1929 0.20% 40.10%
1930 0.10% 9.70%
1931 34.10% 1.10%
1932 2.80% 12.20%
1933 16.40% 6.80%
1934 36.60% 3.00%
1935 2.90% 4.80%
1936 1.80% 10.40%
1937 0.20% 5.20%
1938 16.00% 0.20%
1939 3.00% 0.70%
1940 18.50% 26.30%
1941 28.00% 0.90%
1942 0.00% 5.50%
1943 1.00% 6.00%
1944 0.30% 9.90%
1945 0.50% 3.20%
1946 11.20% 2.40%
1947 0.30% 3.30%
1948 0.80% 15.20%
1949 12.90% 20.90%
1950 0.40% 28.60%
1951 0.00% 25.80%
1952 0.80% 5.10%
1953 9.80% 2.30%
1954 12.60% 0.30%
1955 0.00% 19.40%
1956 0.20% 4.80%
1957 6.40% 0.50%
1958 13.80% 13.50%
1959 0.70% 1.30%
1960 0.00% 11.80%
1961 0.30% 7.40%
1962 0.20% 3.70%
1963 2.00% 24.60%
1964 0.00% 14.40%
1965 0.20% 1.90%
1966 0.00% 18.30%
1967 1.50% 7.20%
1968 0.00% 18.30%
1969 0.80% 7.20%
1970 0.30% 3.90%
1971 0.00% 5.10%
1972 0.00% 4.20%
1973 18.40% 5.20%
1974 0.30% 1.60%
1975 0.40% 12.10%
1976 0.00% 42.40%
1977 2.00% 0.70%
1978 1.90% 28.10%
1979 1.00% 31.50%
1980 1.50% 0.70%
1981 30.20% 7.00%
1982 1.00% 2.80%
1983 12.30% 6.90%
1984 1.70% 2.30%
1985 0.70% 17.80%
1986 36.70% 0.00%
1987 25.00% 1.90%
1988 1.10% 11.10%
1989 0.80% 13.40%
1990 23.10% 0.60%
1991 27.40% 0.00%
1992 15.70% 0.20%
1993 0.30% 6.70%
1994 10.00% 0.30%
1995 15.10% 0.00%
1996 10.90% 12.60%
1997 11.30% 1.10%
1998 75.80% 0.00%
1999 29.70% 0.70%
2000 19.70% 0.30%
2001 33.40% 0.00%
2002 18.10% 0.60%
2003 31.70% 0.00%
2004 28.80% 0.00%
2005 35.40% 0.00%
2006 48.00% 0.30%
2007 27.90% 0.00%
2008 2.60% 2.10%
2009 3.10% 0.80%
2010 22.00% 0.80%
2011 16.90% 0.90%
2012 78.80% 0.00%
2013 6.90% 1.70%

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.