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 22.60% 0.00%
1911 26.90% 2.90%
1912 0.00% 52.40%
1913 0.90% 21.10%
1914 0.90% 10.80%
1915 0.00% 37.60%
1916 5.90% 0.00%
1917 3.00% 7.40%
1918 0.00% 4.80%
1919 0.00% 51.00%
1920 0.00% 30.30%
1921 66.00% 0.00%
1922 4.70% 0.90%
1923 0.00% 21.60%
1924 0.00% 14.50%
1925 24.00% 0.00%
1926 0.00% 10.60%
1927 25.20% 0.00%
1928 0.00% 1.00%
1929 0.00% 39.70%
1930 0.00% 3.00%
1931 6.30% 2.80%
1932 0.00% 9.70%
1933 66.90% 0.00%
1934 71.90% 0.00%
1935 0.00% 1.90%
1936 9.10% 1.00%
1937 0.00% 4.60%
1938 48.40% 0.00%
1939 54.80% 0.00%
1940 0.00% 31.60%
1941 0.00% 20.00%
1942 0.00% 0.90%
1943 7.50% 0.00%
1944 0.00% 2.80%
1945 2.00% 0.90%
1946 22.70% 0.00%
1947 0.00% 0.00%
1948 2.00% 0.00%
1949 1.00% 2.80%
1950 9.70% 1.80%
1951 6.80% 14.30%
1952 6.60% 0.00%
1953 33.70% 0.00%
1954 92.10% 0.00%
1955 0.00% 0.00%
1956 62.00% 0.00%
1957 0.00% 19.80%
1958 0.00% 50.70%
1959 0.00% 4.90%
1960 0.00% 36.60%
1961 0.00% 28.40%
1962 0.00% 0.00%
1963 17.50% 0.00%
1964 0.90% 0.00%
1965 0.00% 1.00%
1966 0.00% 18.50%
1967 0.00% 0.00%
1968 0.00% 52.90%
1969 0.00% 13.50%
1970 0.00% 3.00%
1971 0.00% 0.00%
1972 0.00% 0.00%
1973 0.00% 5.70%
1974 0.00% 0.00%
1975 0.00% 0.90%
1976 0.00% 21.50%
1977 4.80% 0.00%
1978 0.00% 19.00%
1979 0.00% 70.10%
1980 0.00% 0.00%
1981 1.80% 1.00%
1982 0.00% 3.60%
1983 0.00% 64.10%
1984 0.00% 0.90%
1985 0.00% 18.20%
1986 5.40% 0.00%
1987 0.90% 4.90%
1988 0.00% 0.00%
1989 1.00% 30.50%
1990 8.70% 0.00%
1991 0.00% 1.90%
1992 0.00% 6.80%
1993 0.00% 55.70%
1994 3.80% 1.00%
1995 1.00% 0.00%
1996 3.90% 4.60%
1997 0.00% 23.70%
1998 28.80% 0.00%
1999 56.30% 0.00%
2000 16.10% 0.00%
2001 2.90% 0.00%
2002 1.80% 0.00%
2003 7.60% 0.00%
2004 0.00% 0.00%
2005 9.50% 0.00%
2006 79.10% 0.00%
2007 2.80% 3.90%
2008 9.90% 5.40%
2009 4.90% 6.60%
2010 0.00% 2.00%
2011 55.50% 0.00%
2012 89.40% 0.00%
2013 0.00% 11.40%

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.