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 0.00% 23.30%
1911 61.50% 0.00%
1912 1.70% 8.00%
1913 9.30% 0.00%
1914 0.00% 1.60%
1915 0.00% 1.70%
1916 0.00% 1.70%
1917 0.00% 70.70%
1918 4.90% 1.50%
1919 17.90% 0.00%
1920 0.00% 11.20%
1921 72.00% 0.00%
1922 63.30% 0.00%
1923 4.90% 0.00%
1924 0.00% 36.50%
1925 16.30% 0.00%
1926 0.00% 3.10%
1927 43.80% 1.50%
1928 0.00% 3.40%
1929 1.60% 1.50%
1930 0.00% 1.60%
1931 4.60% 0.00%
1932 27.80% 0.00%
1933 38.80% 0.00%
1934 0.00% 1.50%
1935 3.30% 0.00%
1936 0.00% 0.00%
1937 0.00% 0.00%
1938 6.50% 0.00%
1939 0.00% 0.00%
1940 0.00% 80.80%
1941 0.00% 1.60%
1942 0.00% 3.40%
1943 0.00% 14.90%
1944 0.00% 0.00%
1945 3.20% 0.00%
1946 11.50% 0.00%
1947 0.00% 0.00%
1948 8.60% 0.00%
1949 72.20% 0.00%
1950 0.00% 0.00%
1951 0.00% 0.00%
1952 0.00% 0.00%
1953 1.50% 0.00%
1954 0.00% 0.00%
1955 0.00% 0.00%
1956 1.50% 3.50%
1957 25.70% 0.00%
1958 0.00% 52.80%
1959 1.70% 0.00%
1960 0.00% 38.50%
1961 0.00% 8.20%
1962 0.00% 4.60%
1963 0.00% 90.00%
1964 0.00% 4.80%
1965 0.00% 0.00%
1966 0.00% 44.40%
1967 0.00% 48.00%
1968 0.00% 89.20%
1969 0.00% 47.10%
1970 0.00% 5.00%
1971 0.00% 0.00%
1972 0.00% 0.00%
1973 6.20% 0.00%
1974 0.00% 0.00%
1975 0.00% 0.00%
1976 0.00% 90.40%
1977 0.00% 6.80%
1978 0.00% 28.80%
1979 0.00% 9.80%
1980 0.00% 1.70%
1981 0.00% 66.50%
1982 8.40% 0.00%
1983 0.00% 13.20%
1984 0.00% 0.00%
1985 4.90% 0.00%
1986 32.40% 0.00%
1987 0.00% 1.70%
1988 0.00% 54.40%
1989 1.70% 0.00%
1990 69.10% 0.00%
1991 83.80% 0.00%
1992 0.00% 0.00%
1993 0.00% 0.00%
1994 10.20% 1.50%
1995 0.00% 0.00%
1996 0.00% 1.60%
1997 3.30% 1.50%
1998 96.70% 0.00%
1999 1.60% 0.00%
2000 0.00% 3.20%
2001 0.00% 0.00%
2002 38.50% 0.00%
2003 4.90% 0.00%
2004 37.90% 0.00%
2005 12.60% 0.00%
2006 9.30% 0.00%
2007 33.80% 0.00%
2008 0.00% 0.00%
2009 6.50% 0.00%
2010 1.50% 6.80%
2011 27.10% 1.70%
2012 85.40% 0.00%
2013 16.60% 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.