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 4.00% 15.30%
1911 0.00% 3.90%
1912 0.00% 54.50%
1913 0.00% 31.50%
1914 1.90% 5.80%
1915 3.80% 6.00%
1916 0.00% 51.50%
1917 13.50% 2.00%
1918 7.60% 0.00%
1919 19.90% 2.00%
1920 3.70% 0.00%
1921 4.00% 7.60%
1922 41.80% 0.00%
1923 3.90% 9.90%
1924 3.80% 3.80%
1925 7.40% 2.00%
1926 42.20% 0.00%
1927 0.00% 2.00%
1928 0.00% 0.00%
1929 0.00% 0.00%
1930 0.00% 0.00%
1931 19.60% 0.00%
1932 0.00% 3.80%
1933 10.00% 2.00%
1934 5.90% 0.00%
1935 2.00% 2.00%
1936 9.70% 0.00%
1937 0.00% 0.00%
1938 11.10% 2.00%
1939 3.70% 0.00%
1940 55.90% 0.00%
1941 2.00% 7.90%
1942 0.00% 0.00%
1943 0.00% 23.00%
1944 0.00% 27.80%
1945 0.00% 0.00%
1946 0.00% 0.00%
1947 2.00% 35.10%
1948 2.00% 17.20%
1949 0.00% 1.80%
1950 0.00% 4.00%
1951 7.60% 8.00%
1952 0.00% 2.00%
1953 0.00% 38.80%
1954 0.00% 82.20%
1955 0.00% 24.70%
1956 0.00% 0.00%
1957 3.90% 18.70%
1958 60.40% 0.00%
1959 0.00% 0.00%
1960 8.00% 0.00%
1961 92.10% 0.00%
1962 0.00% 3.70%
1963 0.00% 42.70%
1964 0.00% 55.00%
1965 0.00% 14.00%
1966 0.00% 9.30%
1967 66.30% 0.00%
1968 2.00% 4.00%
1969 0.00% 0.00%
1970 35.90% 0.00%
1971 0.00% 2.00%
1972 5.70% 0.00%
1973 0.00% 0.00%
1974 2.00% 0.00%
1975 0.00% 22.60%
1976 0.00% 74.60%
1977 7.70% 0.00%
1978 1.80% 2.00%
1979 1.80% 0.00%
1980 0.00% 62.70%
1981 0.00% 1.80%
1982 0.00% 0.00%
1983 0.00% 38.40%
1984 0.00% 0.00%
1985 22.60% 0.00%
1986 5.90% 0.00%
1987 0.00% 0.00%
1988 11.90% 0.00%
1989 0.00% 0.00%
1990 1.80% 2.00%
1991 0.00% 3.80%
1992 32.70% 0.00%
1993 2.00% 84.60%
1994 29.20% 0.00%
1995 2.00% 32.50%
1996 19.40% 0.00%
1997 7.80% 1.80%
1998 28.40% 0.00%
1999 0.00% 7.50%
2000 8.00% 0.00%
2001 0.00% 3.60%
2002 7.90% 0.00%
2003 94.20% 0.00%
2004 32.30% 0.00%
2005 5.70% 0.00%
2006 54.10% 0.00%
2007 37.40% 0.00%
2008 4.00% 2.00%
2009 28.30% 2.00%
2010 0.00% 9.80%
2011 0.00% 7.40%
2012 21.80% 0.00%
2013 60.60% 0.00%

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.