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 0.00% 14.70%
1911 43.90% 0.00%
1912 0.00% 40.60%
1913 14.20% 0.00%
1914 0.00% 6.50%
1915 1.70% 11.50%
1916 3.10% 0.00%
1917 0.00% 39.50%
1918 0.00% 1.60%
1919 1.50% 0.00%
1920 0.00% 50.00%
1921 77.30% 0.00%
1922 8.00% 0.00%
1923 0.00% 3.20%
1924 0.00% 36.50%
1925 46.90% 1.50%
1926 0.00% 4.70%
1927 44.50% 0.00%
1928 0.00% 6.50%
1929 0.00% 3.20%
1930 3.10% 11.80%
1931 41.80% 0.00%
1932 20.70% 0.00%
1933 66.10% 0.00%
1934 0.00% 0.00%
1935 1.60% 4.60%
1936 0.00% 0.00%
1937 0.00% 0.00%
1938 30.80% 0.00%
1939 28.50% 0.00%
1940 0.00% 71.30%
1941 3.20% 0.00%
1942 0.00% 0.00%
1943 3.10% 0.00%
1944 0.00% 0.00%
1945 3.40% 0.00%
1946 19.20% 0.00%
1947 0.00% 4.90%
1948 5.20% 0.00%
1949 13.00% 0.00%
1950 0.00% 1.60%
1951 9.90% 0.00%
1952 8.00% 0.00%
1953 45.80% 0.00%
1954 56.80% 1.70%
1955 1.70% 0.00%
1956 3.20% 0.00%
1957 0.00% 0.00%
1958 0.00% 88.50%
1959 1.50% 0.00%
1960 0.00% 38.50%
1961 0.00% 0.00%
1962 0.00% 17.10%
1963 0.00% 11.40%
1964 0.00% 11.50%
1965 0.00% 0.00%
1966 0.00% 66.70%
1967 0.00% 6.20%
1968 0.00% 26.40%
1969 0.00% 77.50%
1970 0.00% 1.70%
1971 0.00% 0.00%
1972 0.00% 9.20%
1973 0.00% 0.00%
1974 0.00% 0.00%
1975 5.20% 0.00%
1976 0.00% 39.20%
1977 0.00% 0.00%
1978 0.00% 15.70%
1979 0.00% 62.50%
1980 0.00% 1.50%
1981 0.00% 3.10%
1982 0.00% 1.60%
1983 0.00% 49.30%
1984 0.00% 0.00%
1985 0.00% 1.60%
1986 9.90% 0.00%
1987 1.60% 0.00%
1988 0.00% 3.30%
1989 1.70% 24.20%
1990 90.50% 0.00%
1991 12.40% 0.00%
1992 0.00% 37.30%
1993 0.00% 3.30%
1994 0.00% 0.00%
1995 0.00% 0.00%
1996 0.00% 20.40%
1997 0.00% 16.10%
1998 56.30% 0.00%
1999 40.10% 0.00%
2000 1.70% 0.00%
2001 11.10% 0.00%
2002 15.90% 0.00%
2003 0.00% 7.90%
2004 1.70% 0.00%
2005 0.00% 0.00%
2006 40.50% 0.00%
2007 72.30% 0.00%
2008 3.40% 0.00%
2009 3.40% 3.20%
2010 1.50% 3.40%
2011 48.70% 0.00%
2012 64.40% 0.00%
2013 5.10% 33.70%

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.