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
1911 0.00% 1.50%
1912 0.00% 79.50%
1913 0.00% 0.00%
1914 1.60% 0.00%
1915 0.00% 0.00%
1916 0.00% 4.50%
1917 0.00% 68.80%
1918 0.00% 91.90%
1919 32.60% 0.00%
1920 0.00% 72.60%
1921 37.30% 0.00%
1922 0.00% 0.00%
1923 0.00% 0.00%
1924 3.20% 0.00%
1925 0.00% 3.10%
1926 0.00% 0.00%
1927 0.00% 0.00%
1928 0.00% 1.60%
1929 0.00% 28.30%
1930 0.00% 0.00%
1931 85.60% 0.00%
1932 60.70% 0.00%
1933 9.90% 0.00%
1934 3.30% 0.00%
1935 0.00% 0.00%
1936 0.00% 100.00%
1937 6.40% 3.00%
1938 0.00% 0.00%
1939 0.00% 0.00%
1940 1.50% 0.00%
1941 0.00% 0.00%
1942 10.90% 0.00%
1943 0.00% 0.00%
1944 77.60% 0.00%
1945 0.00% 0.00%
1946 0.00% 0.00%
1947 0.00% 0.00%
1948 0.00% 0.00%
1949 4.80% 0.00%
1950 3.30% 7.50%
1951 0.00% 1.60%
1952 0.00% 0.00%
1953 7.90% 0.00%
1954 43.90% 0.00%
1955 0.00% 0.00%
1956 0.00% 3.10%
1957 0.00% 0.00%
1958 9.10% 0.00%
1959 0.00% 28.40%
1960 0.00% 0.00%
1961 0.00% 0.00%
1962 0.00% 3.40%
1963 0.00% 48.00%
1964 0.00% 0.00%
1965 0.00% 10.70%
1966 0.00% 0.00%
1967 0.00% 0.00%
1968 0.00% 0.00%
1969 0.00% 6.40%
1970 0.00% 0.00%
1971 0.00% 0.00%
1972 0.00% 4.70%
1973 0.00% 0.00%
1974 0.00% 0.00%
1975 4.60% 0.00%
1976 16.60% 0.00%
1977 0.00% 39.70%
1978 0.00% 60.90%
1979 0.00% 100.00%
1980 0.00% 0.00%
1981 17.90% 0.00%
1982 0.00% 30.60%
1983 65.80% 0.00%
1984 0.00% 3.30%
1985 0.00% 0.00%
1986 0.00% 3.30%
1987 85.30% 0.00%
1988 0.00% 0.00%
1989 0.00% 0.00%
1990 1.50% 0.00%
1991 0.00% 0.00%
1992 63.20% 0.00%
1993 0.00% 0.00%
1994 0.00% 40.80%
1995 3.10% 0.00%
1996 0.00% 0.00%
1997 0.00% 4.80%
1998 80.30% 0.00%
1999 49.20% 0.00%
2000 80.80% 0.00%
2001 0.00% 26.30%
2002 100.00% 0.00%
2003 0.00% 0.00%
2004 0.00% 0.00%
2005 1.70% 0.00%
2006 24.50% 0.00%
2007 1.60% 0.00%
2008 0.00% 6.60%
2009 0.00% 0.00%
2010 0.00% 19.80%
2011 0.00% 4.90%
2012 96.70% 0.00%
2013 1.60% 0.00%
2014 0.00% 85.40%

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.