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% 2.30%
1911 0.00% 0.00%
1912 0.00% 65.70%
1913 34.30% 0.00%
1914 0.00% 45.80%
1915 0.00% 2.50%
1916 0.00% 17.30%
1917 0.00% 100.00%
1918 0.00% 7.00%
1919 0.00% 0.00%
1920 0.00% 34.60%
1921 65.90% 0.00%
1922 0.00% 0.00%
1923 0.00% 14.10%
1924 0.00% 83.10%
1925 0.00% 9.40%
1926 0.00% 100.00%
1927 0.00% 0.00%
1928 0.00% 7.10%
1929 0.00% 2.50%
1930 4.90% 0.00%
1931 51.10% 0.00%
1932 2.50% 0.00%
1933 0.00% 2.50%
1934 0.00% 6.90%
1935 0.00% 17.10%
1936 0.00% 2.30%
1937 6.90% 0.00%
1938 29.40% 2.30%
1939 0.00% 0.00%
1940 0.00% 90.70%
1941 0.00% 0.00%
1942 2.30% 0.00%
1943 0.00% 38.30%
1944 0.00% 0.00%
1945 0.00% 0.00%
1946 44.10% 0.00%
1947 0.00% 0.00%
1948 0.00% 0.00%
1949 90.00% 0.00%
1950 0.00% 2.60%
1951 0.00% 0.00%
1952 7.10% 0.00%
1953 87.60% 0.00%
1954 0.00% 0.00%
1955 2.50% 0.00%
1956 0.00% 0.00%
1957 4.90% 0.00%
1958 0.00% 83.50%
1959 0.00% 0.00%
1960 0.00% 2.50%
1961 0.00% 2.50%
1962 0.00% 7.10%
1963 0.00% 0.00%
1964 0.00% 0.00%
1965 0.00% 4.90%
1966 0.00% 0.00%
1967 0.00% 9.90%
1968 0.00% 2.40%
1969 0.00% 0.00%
1970 0.00% 0.00%
1971 0.00% 0.00%
1972 0.00% 85.20%
1973 0.00% 0.00%
1974 0.00% 0.00%
1975 0.00% 0.00%
1976 0.00% 12.30%
1977 0.00% 2.50%
1978 0.00% 56.50%
1979 0.00% 5.00%
1980 0.00% 14.70%
1981 0.00% 0.00%
1982 0.00% 0.00%
1983 0.00% 0.00%
1984 0.00% 0.00%
1985 0.00% 0.00%
1986 0.00% 0.00%
1987 0.00% 0.00%
1988 0.00% 0.00%
1989 0.00% 4.90%
1990 75.90% 0.00%
1991 85.90% 0.00%
1992 0.00% 36.80%
1993 0.00% 0.00%
1994 0.00% 0.00%
1995 0.00% 0.00%
1996 0.00% 12.50%
1997 0.00% 0.00%
1998 100.00% 0.00%
1999 75.30% 0.00%
2000 0.00% 0.00%
2001 67.90% 0.00%
2002 22.50% 0.00%
2003 0.00% 2.50%
2004 0.00% 0.00%
2005 2.40% 0.00%
2006 53.60% 0.00%
2007 5.10% 0.00%
2008 0.00% 0.00%
2009 0.00% 0.00%
2010 29.10% 0.00%
2011 43.80% 0.00%
2012 100.00% 0.00%
2013 0.00% 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.