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 3.10% 4.40%
1911 17.60% 8.00%
1912 0.60% 52.50%
1913 2.00% 22.70%
1914 4.40% 3.80%
1915 1.40% 10.60%
1916 1.60% 17.50%
1917 0.20% 67.30%
1918 1.50% 9.60%
1919 2.50% 6.50%
1920 0.20% 26.00%
1921 42.40% 1.00%
1922 7.40% 20.60%
1923 0.80% 14.00%
1924 0.20% 47.60%
1925 10.90% 0.30%
1926 9.30% 11.20%
1927 15.30% 1.10%
1928 1.00% 1.00%
1929 0.50% 40.00%
1930 0.60% 2.80%
1931 14.20% 7.40%
1932 10.40% 4.40%
1933 7.00% 17.20%
1934 35.50% 5.40%
1935 6.80% 0.70%
1936 3.50% 13.50%
1937 2.50% 21.10%
1938 26.60% 0.20%
1939 1.10% 1.80%
1940 13.50% 35.20%
1941 12.20% 2.10%
1942 0.40% 14.20%
1943 1.60% 5.00%
1944 1.00% 13.90%
1945 1.50% 1.10%
1946 6.00% 0.70%
1947 0.00% 11.60%
1948 0.20% 13.30%
1949 17.30% 27.10%
1950 2.80% 32.60%
1951 0.10% 13.60%
1952 6.80% 2.50%
1953 10.10% 1.00%
1954 8.30% 1.20%
1955 1.70% 26.60%
1956 0.00% 2.30%
1957 9.90% 1.10%
1958 11.40% 9.30%
1959 0.90% 0.40%
1960 0.50% 19.00%
1961 10.60% 7.10%
1962 0.00% 5.10%
1963 0.00% 17.00%
1964 0.00% 17.20%
1965 0.00% 11.10%
1966 0.00% 10.90%
1967 0.70% 3.10%
1968 0.20% 13.30%
1969 1.10% 5.40%
1970 0.40% 5.90%
1971 0.20% 25.40%
1972 0.60% 2.80%
1973 13.10% 7.30%
1974 2.40% 1.60%
1975 0.30% 12.50%
1976 0.30% 3.80%
1977 1.50% 2.30%
1978 7.70% 39.50%
1979 0.50% 40.60%
1980 0.20% 0.20%
1981 18.30% 2.40%
1982 0.20% 15.00%
1983 26.70% 4.80%
1984 5.30% 6.70%
1985 0.20% 3.80%
1986 36.30% 0.20%
1987 28.00% 1.50%
1988 0.40% 14.60%
1989 2.00% 1.00%
1990 30.80% 0.00%
1991 42.70% 0.40%
1992 24.90% 0.00%
1993 2.30% 3.70%
1994 9.40% 1.70%
1995 5.80% 0.00%
1996 11.30% 3.90%
1997 6.50% 0.80%
1998 61.00% 0.20%
1999 34.70% 0.90%
2000 49.50% 0.00%
2001 12.50% 0.00%
2002 15.70% 0.40%
2003 29.60% 0.10%
2004 13.40% 0.00%
2005 24.90% 0.00%
2006 63.50% 0.00%
2007 20.90% 0.00%
2008 0.90% 2.80%
2009 4.20% 0.40%
2010 23.90% 0.40%
2011 11.10% 0.60%
2012 76.00% 0.00%
2013 7.80% 0.60%
2014 17.60% 23.70%

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.