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 55.20% 0.00%
1911 0.00% 22.50%
1912 0.00% 58.90%
1913 0.00% 2.70%
1914 13.60% 0.00%
1915 0.00% 14.30%
1916 8.50% 0.00%
1917 0.00% 74.80%
1918 0.00% 2.90%
1919 2.90% 8.60%
1920 0.00% 5.60%
1921 0.00% 11.20%
1922 0.00% 27.50%
1923 0.00% 2.90%
1924 21.70% 2.80%
1925 2.90% 2.70%
1926 63.00% 0.00%
1927 0.00% 5.50%
1928 16.90% 0.00%
1929 0.00% 2.80%
1930 2.80% 2.80%
1931 75.20% 0.00%
1932 0.00% 2.70%
1933 0.00% 21.80%
1934 100.00% 0.00%
1935 0.00% 25.50%
1936 16.40% 0.00%
1937 0.00% 2.90%
1938 0.00% 11.40%
1939 29.60% 0.00%
1940 16.60% 0.00%
1941 0.00% 3.00%
1942 0.00% 13.70%
1943 0.00% 0.00%
1944 0.00% 5.60%
1945 0.00% 14.20%
1946 0.00% 0.00%
1947 30.20% 0.00%
1948 0.00% 57.90%
1949 0.00% 0.00%
1950 0.00% 0.00%
1951 0.00% 0.00%
1952 0.00% 0.00%
1953 0.00% 11.00%
1954 0.00% 0.00%
1955 0.00% 8.00%
1956 0.00% 0.00%
1957 0.00% 3.00%
1958 0.00% 0.00%
1959 17.00% 0.00%
1960 0.00% 2.70%
1961 0.00% 2.70%
1962 0.00% 0.00%
1963 0.00% 44.70%
1964 0.00% 8.20%
1965 0.00% 5.70%
1966 44.00% 0.00%
1967 0.00% 86.00%
1968 0.00% 0.00%
1969 0.00% 0.00%
1970 0.00% 2.70%
1971 0.00% 22.10%
1972 11.20% 0.00%
1973 0.00% 2.90%
1974 0.00% 0.00%
1975 0.00% 77.60%
1976 0.00% 0.00%
1977 0.00% 8.60%
1978 0.00% 0.00%
1979 0.00% 0.00%
1980 0.00% 8.60%
1981 0.00% 0.00%
1982 0.00% 5.60%
1983 0.00% 41.30%
1984 17.10% 0.00%
1985 0.00% 3.00%
1986 0.00% 0.00%
1987 27.60% 0.00%
1988 2.80% 0.00%
1989 17.10% 0.00%
1990 0.00% 0.00%
1991 0.00% 63.40%
1992 62.80% 0.00%
1993 11.70% 0.00%
1994 2.70% 0.00%
1995 0.00% 30.50%
1996 8.80% 0.00%
1997 70.40% 0.00%
1998 0.00% 69.20%
1999 0.00% 14.30%
2000 11.70% 0.00%
2001 38.30% 0.00%
2002 0.00% 0.00%
2003 0.00% 0.00%
2004 97.30% 0.00%
2005 0.00% 0.00%
2006 0.00% 8.40%
2007 72.10% 0.00%
2008 3.00% 0.00%
2009 3.00% 0.00%
2010 0.00% 33.10%
2011 0.00% 27.10%
2012 11.00% 0.00%
2013 50.60% 0.00%
2014 56.10% 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.