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 13.60% 2.20%
1911 11.10% 14.50%
1912 0.00% 63.80%
1913 5.10% 19.20%
1914 4.00% 2.70%
1915 0.60% 25.10%
1916 1.20% 23.40%
1917 1.00% 35.30%
1918 0.60% 3.00%
1919 1.80% 18.00%
1920 0.30% 32.20%
1921 43.50% 0.50%
1922 3.20% 10.80%
1923 0.00% 18.20%
1924 2.70% 20.70%
1925 15.50% 1.20%
1926 12.80% 14.40%
1927 14.00% 5.60%
1928 1.90% 3.40%
1929 0.40% 32.10%
1930 6.60% 3.30%
1931 32.80% 2.40%
1932 3.00% 3.60%
1933 23.20% 2.80%
1934 66.20% 0.30%
1935 1.20% 2.30%
1936 6.20% 1.90%
1937 0.80% 2.50%
1938 25.40% 3.10%
1939 29.10% 0.10%
1940 6.90% 28.50%
1941 2.30% 15.80%
1942 0.30% 2.60%
1943 6.40% 1.40%
1944 2.20% 8.80%
1945 2.90% 1.60%
1946 15.30% 0.70%
1947 0.50% 1.80%
1948 0.30% 8.30%
1949 7.70% 2.30%
1950 3.80% 20.80%
1951 0.50% 26.20%
1952 6.70% 1.50%
1953 35.10% 0.20%
1954 42.50% 2.30%
1955 3.10% 14.60%
1956 10.00% 2.30%
1957 0.10% 20.60%
1958 6.00% 25.70%
1959 5.60% 2.90%
1960 0.20% 8.10%
1961 2.70% 4.20%
1962 0.20% 1.70%
1963 14.00% 3.00%
1964 1.40% 10.30%
1965 0.00% 14.90%
1966 1.60% 11.90%
1967 3.70% 4.20%
1968 0.20% 13.10%
1969 0.00% 13.00%
1970 0.40% 6.80%
1971 0.00% 4.30%
1972 0.20% 18.60%
1973 0.60% 13.10%
1974 0.80% 0.90%
1975 0.70% 24.40%
1976 4.60% 7.50%
1977 1.60% 0.40%
1978 0.00% 24.60%
1979 0.00% 50.00%
1980 0.50% 1.70%
1981 17.50% 0.60%
1982 0.00% 31.70%
1983 0.50% 12.50%
1984 1.80% 11.50%
1985 0.00% 10.90%
1986 5.30% 0.20%
1987 29.80% 1.90%
1988 18.30% 0.50%
1989 6.30% 1.70%
1990 27.30% 0.00%
1991 7.90% 0.70%
1992 20.40% 8.00%
1993 0.00% 41.80%
1994 9.90% 0.50%
1995 1.70% 0.80%
1996 9.20% 26.90%
1997 4.30% 7.00%
1998 28.50% 5.20%
1999 37.40% 0.70%
2000 26.40% 0.00%
2001 22.20% 0.10%
2002 17.60% 0.20%
2003 25.70% 1.30%
2004 3.60% 0.20%
2005 15.90% 0.50%
2006 44.00% 0.30%
2007 38.80% 1.30%
2008 4.80% 2.30%
2009 9.80% 0.60%
2010 11.00% 1.70%
2011 21.60% 1.80%
2012 83.40% 0.00%
2013 5.80% 6.60%
2014 21.70% 23.90%

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.