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% 8.20%
1911 0.00% 1.60%
1912 0.00% 89.30%
1913 1.60% 0.00%
1914 0.00% 1.60%
1915 0.00% 0.00%
1916 0.00% 66.20%
1917 0.00% 98.50%
1918 0.00% 7.90%
1919 0.00% 0.00%
1920 0.00% 6.50%
1921 62.70% 0.00%
1922 0.00% 0.00%
1923 0.00% 6.30%
1924 0.00% 89.30%
1925 0.00% 0.00%
1926 0.00% 44.20%
1927 0.00% 4.70%
1928 0.00% 1.50%
1929 0.00% 92.00%
1930 1.60% 0.00%
1931 98.40% 0.00%
1932 0.00% 0.00%
1933 1.60% 1.50%
1934 1.60% 3.10%
1935 0.00% 1.50%
1936 0.00% 60.90%
1937 0.00% 18.90%
1938 16.40% 0.00%
1939 0.00% 0.00%
1940 0.00% 0.00%
1941 48.00% 0.00%
1942 0.00% 0.00%
1943 0.00% 9.40%
1944 1.70% 0.00%
1945 0.00% 1.60%
1946 0.00% 0.00%
1947 0.00% 0.00%
1948 0.00% 0.00%
1949 1.70% 0.00%
1950 0.00% 88.60%
1951 0.00% 49.90%
1952 0.00% 0.00%
1953 6.20% 0.00%
1954 3.30% 0.00%
1955 0.00% 0.00%
1956 0.00% 0.00%
1957 0.00% 0.00%
1958 0.00% 1.60%
1959 0.00% 0.00%
1960 0.00% 0.00%
1961 0.00% 0.00%
1962 0.00% 0.00%
1963 0.00% 9.70%
1964 0.00% 0.00%
1965 0.00% 0.00%
1966 0.00% 9.60%
1967 0.00% 9.40%
1968 0.00% 0.00%
1969 0.00% 0.00%
1970 0.00% 0.00%
1971 0.00% 0.00%
1972 0.00% 34.40%
1973 62.50% 0.00%
1974 0.00% 0.00%
1975 0.00% 1.50%
1976 0.00% 35.40%
1977 0.00% 0.00%
1978 0.00% 26.10%
1979 0.00% 38.60%
1980 0.00% 0.00%
1981 10.70% 0.00%
1982 0.00% 1.70%
1983 9.10% 0.00%
1984 0.00% 0.00%
1985 0.00% 5.00%
1986 5.00% 0.00%
1987 98.40% 0.00%
1988 0.00% 0.00%
1989 0.00% 21.80%
1990 8.30% 0.00%
1991 4.80% 0.00%
1992 0.00% 0.00%
1993 0.00% 1.60%
1994 0.00% 0.00%
1995 0.00% 0.00%
1996 0.00% 40.80%
1997 0.00% 0.00%
1998 100.00% 0.00%
1999 82.00% 0.00%
2000 1.50% 0.00%
2001 67.80% 0.00%
2002 33.50% 0.00%
2003 0.00% 0.00%
2004 0.00% 0.00%
2005 68.00% 0.00%
2006 98.30% 0.00%
2007 27.20% 0.00%
2008 0.00% 4.90%
2009 0.00% 0.00%
2010 64.20% 0.00%
2011 13.90% 0.00%
2012 100.00% 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.