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 27.20% 0.00%
1911 0.00% 0.00%
1912 0.00% 0.00%
1913 0.00% 0.00%
1914 0.00% 0.00%
1915 0.00% 2.50%
1916 0.00% 59.00%
1917 0.00% 97.50%
1918 29.80% 0.00%
1919 0.00% 0.00%
1920 0.00% 0.00%
1921 100.00% 0.00%
1922 0.00% 0.00%
1923 0.00% 18.80%
1924 0.00% 92.90%
1925 0.00% 0.00%
1926 0.00% 80.00%
1927 0.00% 0.00%
1928 0.00% 21.90%
1929 0.00% 0.00%
1930 0.00% 0.00%
1931 4.60% 5.10%
1932 0.00% 29.30%
1933 0.00% 0.00%
1934 0.00% 0.00%
1935 0.00% 2.30%
1936 0.00% 0.00%
1937 0.00% 14.80%
1938 0.00% 2.30%
1939 0.00% 19.00%
1940 0.00% 90.70%
1941 2.40% 0.00%
1942 43.60% 0.00%
1943 0.00% 45.60%
1944 0.00% 0.00%
1945 95.10% 0.00%
1946 63.40% 0.00%
1947 0.00% 14.80%
1948 0.00% 0.00%
1949 4.90% 0.00%
1950 0.00% 44.70%
1951 0.00% 0.00%
1952 0.00% 0.00%
1953 0.00% 0.00%
1954 0.00% 0.00%
1955 24.70% 0.00%
1956 0.00% 67.50%
1957 0.00% 0.00%
1958 0.00% 2.60%
1959 0.00% 0.00%
1960 0.00% 15.10%
1961 0.00% 37.20%
1962 0.00% 0.00%
1963 0.00% 0.00%
1964 0.00% 0.00%
1965 0.00% 0.00%
1966 0.00% 0.00%
1967 0.00% 62.90%
1968 2.40% 0.00%
1969 0.00% 0.00%
1970 0.00% 0.00%
1971 0.00% 27.00%
1972 0.00% 7.30%
1973 0.00% 0.00%
1974 0.00% 9.30%
1975 0.00% 2.50%
1976 2.40% 0.00%
1977 100.00% 0.00%
1978 0.00% 7.50%
1979 0.00% 2.50%
1980 0.00% 2.50%
1981 2.40% 0.00%
1982 0.00% 0.00%
1983 0.00% 5.00%
1984 0.00% 73.90%
1985 47.00% 0.00%
1986 55.30% 0.00%
1987 62.70% 0.00%
1988 0.00% 0.00%
1989 0.00% 0.00%
1990 0.00% 0.00%
1991 95.40% 0.00%
1992 0.00% 2.50%
1993 0.00% 0.00%
1994 0.00% 0.00%
1995 0.00% 0.00%
1996 0.00% 2.50%
1997 0.00% 26.00%
1998 72.50% 0.00%
1999 6.90% 0.00%
2000 17.60% 0.00%
2001 0.00% 0.00%
2002 0.00% 0.00%
2003 0.00% 0.00%
2004 17.40% 0.00%
2005 0.00% 0.00%
2006 9.70% 0.00%
2007 0.00% 0.00%
2008 0.00% 0.00%
2009 0.00% 0.00%
2010 100.00% 0.00%
2011 5.00% 0.00%
2012 100.00% 0.00%
2013 2.30% 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.