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 4.00% 15.30%
1911 0.00% 3.90%
1912 0.00% 54.50%
1913 0.00% 31.50%
1914 1.90% 5.80%
1915 3.80% 6.00%
1916 0.00% 51.50%
1917 13.50% 2.00%
1918 7.60% 0.00%
1919 19.90% 2.00%
1920 3.70% 0.00%
1921 4.00% 7.60%
1922 41.80% 0.00%
1923 3.90% 9.90%
1924 3.80% 3.80%
1925 7.40% 2.00%
1926 42.20% 0.00%
1927 0.00% 2.00%
1928 0.00% 0.00%
1929 0.00% 0.00%
1930 0.00% 0.00%
1931 17.70% 0.00%
1932 0.00% 3.80%
1933 10.00% 2.00%
1934 5.90% 0.00%
1935 2.00% 2.00%
1936 7.80% 0.00%
1937 0.00% 0.00%
1938 9.20% 2.00%
1939 3.70% 0.00%
1940 52.10% 0.00%
1941 2.00% 7.90%
1942 0.00% 0.00%
1943 0.00% 23.00%
1944 0.00% 27.80%
1945 0.00% 0.00%
1946 0.00% 0.00%
1947 2.00% 35.10%
1948 2.00% 17.20%
1949 0.00% 1.80%
1950 0.00% 4.00%
1951 7.60% 8.00%
1952 0.00% 2.00%
1953 0.00% 38.80%
1954 0.00% 82.20%
1955 0.00% 24.70%
1956 0.00% 0.00%
1957 3.90% 18.70%
1958 58.40% 0.00%
1959 0.00% 0.00%
1960 8.00% 0.00%
1961 90.10% 0.00%
1962 0.00% 3.70%
1963 0.00% 42.70%
1964 0.00% 55.00%
1965 0.00% 14.00%
1966 0.00% 7.40%
1967 66.30% 0.00%
1968 2.00% 4.00%
1969 0.00% 0.00%
1970 30.10% 0.00%
1971 0.00% 2.00%
1972 3.80% 0.00%
1973 0.00% 0.00%
1974 2.00% 0.00%
1975 0.00% 22.60%
1976 0.00% 74.60%
1977 7.70% 0.00%
1978 1.80% 2.00%
1979 1.80% 0.00%
1980 0.00% 62.70%
1981 0.00% 1.80%
1982 0.00% 0.00%
1983 0.00% 38.40%
1984 0.00% 0.00%
1985 18.80% 0.00%
1986 5.90% 0.00%
1987 0.00% 0.00%
1988 11.90% 0.00%
1989 0.00% 0.00%
1990 1.80% 2.00%
1991 0.00% 3.80%
1992 32.70% 0.00%
1993 2.00% 84.60%
1994 29.10% 0.00%
1995 2.00% 32.50%
1996 19.40% 0.00%
1997 7.80% 1.80%
1998 28.40% 0.00%
1999 0.00% 7.50%
2000 8.00% 0.00%
2001 0.00% 3.60%
2002 7.90% 0.00%
2003 94.20% 0.00%
2004 34.20% 0.00%
2005 3.90% 0.00%
2006 46.60% 0.00%
2007 37.40% 0.00%
2008 4.00% 2.00%
2009 24.40% 2.00%
2010 0.00% 9.80%
2011 0.00% 7.40%
2012 15.90% 0.00%
2013 52.90% 0.00%
2014 49.80% 1.90%

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.