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 7.80% 0.00%
1911 0.00% 0.00%
1912 0.00% 35.20%
1913 0.00% 9.40%
1914 0.00% 1.60%
1915 1.50% 0.00%
1916 0.00% 15.60%
1917 0.00% 62.50%
1918 0.00% 0.00%
1919 0.00% 0.00%
1920 0.00% 23.60%
1921 46.90% 0.00%
1922 6.50% 0.00%
1923 0.00% 96.90%
1924 0.00% 22.80%
1925 0.00% 0.00%
1926 0.00% 47.70%
1927 0.00% 0.00%
1928 0.00% 9.40%
1929 0.00% 0.00%
1930 0.00% 0.00%
1931 0.00% 0.00%
1932 0.00% 11.30%
1933 0.00% 0.00%
1934 0.00% 3.20%
1935 0.00% 0.00%
1936 0.00% 1.50%
1937 0.00% 0.00%
1938 8.20% 0.00%
1939 0.00% 3.00%
1940 0.00% 47.40%
1941 17.40% 0.00%
1942 10.90% 0.00%
1943 0.00% 94.00%
1944 0.00% 0.00%
1945 1.70% 0.00%
1946 27.20% 0.00%
1947 0.00% 30.70%
1948 0.00% 1.50%
1949 0.00% 0.00%
1950 0.00% 95.00%
1951 0.00% 16.40%
1952 0.00% 0.00%
1953 0.00% 0.00%
1954 0.00% 3.10%
1955 0.00% 0.00%
1956 0.00% 50.10%
1957 0.00% 0.00%
1958 0.00% 0.00%
1959 0.00% 0.00%
1960 0.00% 51.50%
1961 0.00% 0.00%
1962 1.60% 0.00%
1963 1.70% 0.00%
1964 0.00% 0.00%
1965 0.00% 14.40%
1966 0.00% 0.00%
1967 0.00% 3.00%
1968 0.00% 0.00%
1969 0.00% 3.30%
1970 0.00% 12.00%
1971 0.00% 27.40%
1972 0.00% 3.10%
1973 22.00% 0.00%
1974 1.70% 1.50%
1975 0.00% 19.00%
1976 0.00% 0.00%
1977 96.90% 0.00%
1978 0.00% 4.80%
1979 0.00% 9.30%
1980 0.00% 0.00%
1981 0.00% 0.00%
1982 0.00% 0.00%
1983 0.00% 0.00%
1984 0.00% 1.70%
1985 88.80% 0.00%
1986 38.20% 0.00%
1987 90.30% 0.00%
1988 1.50% 0.00%
1989 0.00% 4.60%
1990 0.00% 0.00%
1991 93.90% 0.00%
1992 0.00% 0.00%
1993 0.00% 0.00%
1994 3.10% 0.00%
1995 0.00% 0.00%
1996 0.00% 79.30%
1997 0.00% 18.90%
1998 75.70% 0.00%
1999 40.40% 0.00%
2000 72.60% 0.00%
2001 3.20% 0.00%
2002 0.00% 26.50%
2003 0.00% 0.00%
2004 16.40% 0.00%
2005 0.00% 0.00%
2006 78.80% 0.00%
2007 35.80% 0.00%
2008 0.00% 4.70%
2009 0.00% 0.00%
2010 95.00% 0.00%
2011 1.50% 0.00%
2012 100.00% 0.00%
2013 0.00% 25.00%

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.