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 14.30% 2.30%
1911 20.00% 12.60%
1912 0.00% 73.60%
1913 3.00% 23.30%
1914 1.30% 2.20%
1915 0.60% 32.10%
1916 1.00% 21.70%
1917 0.40% 48.20%
1918 1.10% 2.40%
1919 3.30% 16.30%
1920 0.30% 23.90%
1921 43.80% 0.30%
1922 3.10% 8.20%
1923 0.00% 19.60%
1924 3.10% 26.10%
1925 18.70% 1.30%
1926 11.80% 12.90%
1927 8.80% 4.90%
1928 1.90% 3.30%
1929 0.00% 22.20%
1930 7.80% 1.40%
1931 29.90% 1.40%
1932 5.90% 6.50%
1933 24.70% 4.00%
1934 63.90% 0.30%
1935 1.60% 1.40%
1936 5.60% 1.50%
1937 1.10% 4.80%
1938 25.30% 1.90%
1939 26.90% 0.00%
1940 11.50% 27.40%
1941 1.80% 18.20%
1942 0.10% 3.70%
1943 7.10% 1.20%
1944 2.70% 7.00%
1945 1.70% 1.70%
1946 14.10% 0.00%
1947 0.90% 0.00%
1948 0.40% 7.70%
1949 9.30% 17.80%
1950 3.30% 20.20%
1951 2.10% 22.80%
1952 8.30% 0.70%
1953 33.00% 0.20%
1954 39.60% 4.10%
1955 8.40% 11.60%
1956 14.50% 5.40%
1957 0.10% 13.30%
1958 5.80% 34.90%
1959 3.90% 1.70%
1960 0.50% 17.00%
1961 3.10% 3.20%
1962 0.70% 2.20%
1963 8.70% 2.60%
1964 0.40% 9.50%
1965 0.00% 20.10%
1966 0.90% 17.40%
1967 2.30% 0.80%
1968 0.20% 9.70%
1969 0.00% 16.40%
1970 0.50% 3.70%
1971 0.00% 3.40%
1972 1.20% 12.40%
1973 1.70% 15.70%
1974 0.80% 1.20%
1975 0.70% 25.10%
1976 5.90% 2.20%
1977 1.20% 0.00%
1978 0.20% 29.10%
1979 0.00% 48.40%
1980 0.50% 1.70%
1981 11.50% 1.30%
1982 0.20% 28.70%
1983 0.60% 11.70%
1984 2.20% 12.30%
1985 0.00% 4.00%
1986 6.20% 0.00%
1987 27.80% 1.70%
1988 20.20% 1.90%
1989 5.70% 5.20%
1990 18.50% 0.00%
1991 12.60% 0.60%
1992 24.20% 4.70%
1993 0.00% 35.40%
1994 19.10% 3.00%
1995 1.00% 0.30%
1996 9.80% 10.20%
1997 4.00% 1.80%
1998 26.60% 4.90%
1999 12.90% 0.70%
2000 51.50% 0.00%
2001 16.00% 0.60%
2002 21.10% 0.20%
2003 34.70% 8.80%
2004 4.40% 0.30%
2005 10.80% 0.50%
2006 37.90% 0.30%
2007 34.70% 1.80%
2008 3.70% 3.00%
2009 7.80% 6.40%
2010 10.70% 1.50%
2011 20.20% 1.70%
2012 83.70% 0.00%
2013 6.20% 5.20%
2014 23.70% 16.40%

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.