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 2.90% 22.00%
1911 3.20% 9.70%
1912 0.60% 27.80%
1913 4.30% 10.00%
1914 8.60% 5.20%
1915 0.70% 52.30%
1916 1.40% 18.90%
1917 1.90% 40.70%
1918 6.60% 6.80%
1919 7.30% 12.20%
1920 0.60% 25.90%
1921 22.50% 2.70%
1922 8.10% 0.90%
1923 3.60% 12.10%
1924 2.10% 34.70%
1925 4.00% 2.80%
1926 3.40% 12.20%
1927 1.00% 39.20%
1928 0.80% 19.10%
1929 1.10% 22.30%
1930 3.10% 13.20%
1931 12.70% 4.00%
1932 7.90% 3.00%
1933 11.70% 3.20%
1934 34.60% 1.50%
1935 3.20% 4.00%
1936 34.90% 0.80%
1937 13.00% 0.20%
1938 3.60% 1.60%
1939 2.30% 4.00%
1940 5.40% 7.20%
1941 10.90% 8.60%
1942 2.50% 6.00%
1943 22.60% 12.50%
1944 0.50% 19.10%
1945 0.70% 20.40%
1946 0.40% 13.80%
1947 1.50% 9.20%
1948 0.50% 6.20%
1949 15.00% 6.30%
1950 0.00% 46.40%
1951 2.50% 15.10%
1952 14.30% 3.20%
1953 4.40% 4.70%
1954 17.50% 8.70%
1955 10.00% 9.90%
1956 1.30% 4.50%
1957 1.00% 3.10%
1958 11.40% 8.90%
1959 6.30% 1.30%
1960 1.40% 1.80%
1961 18.80% 19.30%
1962 0.40% 16.00%
1963 8.10% 14.90%
1964 0.20% 3.50%
1965 0.30% 15.10%
1966 0.30% 10.80%
1967 5.60% 29.40%
1968 0.40% 7.10%
1969 1.80% 2.30%
1970 4.10% 1.90%
1971 1.80% 2.50%
1972 2.40% 14.50%
1973 9.40% 8.10%
1974 0.60% 17.60%
1975 1.60% 8.90%
1976 0.40% 33.20%
1977 13.30% 0.50%
1978 1.60% 4.90%
1979 0.30% 8.90%
1980 17.50% 4.10%
1981 10.60% 0.50%
1982 0.70% 8.00%
1983 19.60% 2.90%
1984 5.00% 3.90%
1985 1.40% 12.40%
1986 5.80% 0.60%
1987 12.40% 3.20%
1988 20.60% 1.60%
1989 4.00% 4.20%
1990 9.10% 0.40%
1991 15.70% 1.60%
1992 7.70% 38.60%
1993 13.00% 16.00%
1994 13.70% 0.60%
1995 22.10% 3.50%
1996 10.40% 0.30%
1997 5.80% 2.70%
1998 29.70% 0.20%
1999 11.90% 0.80%
2000 10.00% 0.80%
2001 14.10% 0.50%
2002 34.40% 0.00%
2003 30.40% 0.00%
2004 10.60% 21.10%
2005 32.10% 1.00%
2006 43.30% 0.00%
2007 36.40% 0.20%
2008 8.50% 1.90%
2009 9.70% 6.70%
2010 57.50% 0.80%
2011 59.80% 0.60%
2012 31.90% 0.40%
2013 39.40% 0.40%
2014 21.80% 1.10%

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.