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 34.70% 0.00%
1911 19.80% 0.00%
1912 0.00% 44.20%
1913 21.50% 0.00%
1914 8.30% 1.60%
1915 0.00% 100.00%
1916 0.00% 0.00%
1917 0.00% 38.20%
1918 1.70% 3.00%
1919 8.10% 0.00%
1920 0.00% 3.20%
1921 64.90% 0.00%
1922 1.60% 0.00%
1923 3.20% 0.00%
1924 0.00% 49.50%
1925 0.00% 0.00%
1926 0.00% 14.00%
1927 0.00% 43.80%
1928 0.00% 20.00%
1929 1.50% 1.60%
1930 38.20% 0.00%
1931 50.20% 0.00%
1932 16.90% 0.00%
1933 93.60% 0.00%
1934 48.90% 0.00%
1935 1.60% 0.00%
1936 73.50% 0.00%
1937 36.70% 0.00%
1938 4.90% 0.00%
1939 4.50% 0.00%
1940 0.00% 3.10%
1941 1.60% 0.00%
1942 1.60% 7.70%
1943 0.00% 0.00%
1944 8.10% 0.00%
1945 0.00% 49.60%
1946 0.00% 0.00%
1947 0.00% 3.00%
1948 0.00% 0.00%
1949 32.20% 0.00%
1950 0.00% 30.70%
1951 0.00% 84.10%
1952 0.00% 0.00%
1953 5.00% 0.00%
1954 0.00% 0.00%
1955 46.40% 0.00%
1956 0.00% 0.00%
1957 0.00% 0.00%
1958 0.00% 25.70%
1959 15.80% 0.00%
1960 0.00% 1.70%
1961 18.10% 0.00%
1962 0.00% 1.60%
1963 0.00% 0.00%
1964 0.00% 0.00%
1965 0.00% 6.20%
1966 1.60% 0.00%
1967 0.00% 11.40%
1968 0.00% 6.00%
1969 0.00% 1.60%
1970 15.20% 0.00%
1971 0.00% 0.00%
1972 0.00% 9.70%
1973 0.00% 0.00%
1974 0.00% 0.00%
1975 1.60% 0.00%
1976 51.60% 0.00%
1977 0.00% 1.50%
1978 0.00% 0.00%
1979 0.00% 1.60%
1980 3.20% 0.00%
1981 0.00% 0.00%
1982 0.00% 32.00%
1983 55.60% 0.00%
1984 1.50% 0.00%
1985 0.00% 30.80%
1986 0.00% 1.60%
1987 14.00% 0.00%
1988 96.70% 0.00%
1989 6.00% 1.70%
1990 0.00% 0.00%
1991 7.70% 0.00%
1992 0.00% 100.00%
1993 0.00% 57.10%
1994 0.00% 9.70%
1995 20.50% 0.00%
1996 0.00% 8.30%
1997 0.00% 4.90%
1998 0.00% 4.90%
1999 1.60% 0.00%
2000 0.00% 8.10%
2001 1.50% 0.00%
2002 4.70% 0.00%
2003 0.00% 0.00%
2004 0.00% 86.00%
2005 22.10% 0.00%
2006 32.10% 0.00%
2007 10.90% 0.00%
2008 0.00% 1.60%
2009 0.00% 78.10%
2010 1.70% 0.00%
2011 7.80% 0.00%
2012 73.00% 0.00%
2013 0.00% 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.