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 87.20% 0.00%
1911 12.70% 0.00%
1912 0.00% 3.20%
1913 0.00% 0.00%
1914 0.00% 0.00%
1915 0.00% 0.00%
1916 0.00% 24.70%
1917 0.00% 38.10%
1918 25.70% 0.00%
1919 0.00% 1.60%
1920 0.00% 0.00%
1921 37.50% 0.00%
1922 1.70% 0.00%
1923 0.00% 20.40%
1924 0.00% 36.80%
1925 34.20% 0.00%
1926 0.00% 17.60%
1927 0.00% 0.00%
1928 0.00% 0.00%
1929 0.00% 0.00%
1930 0.00% 0.00%
1931 0.00% 0.00%
1932 0.00% 7.90%
1933 0.00% 0.00%
1934 35.80% 1.60%
1935 0.00% 4.70%
1936 0.00% 1.50%
1937 0.00% 6.30%
1938 1.70% 0.00%
1939 0.00% 0.00%
1940 0.00% 47.60%
1941 1.50% 0.00%
1942 3.20% 0.00%
1943 0.00% 27.20%
1944 0.00% 10.00%
1945 6.50% 1.60%
1946 52.60% 0.00%
1947 0.00% 89.00%
1948 0.00% 0.00%
1949 0.00% 0.00%
1950 0.00% 93.30%
1951 0.00% 37.40%
1952 0.00% 0.00%
1953 0.00% 0.00%
1954 0.00% 18.30%
1955 13.00% 0.00%
1956 0.00% 21.50%
1957 0.00% 0.00%
1958 6.00% 0.00%
1959 0.00% 0.00%
1960 0.00% 32.50%
1961 0.00% 3.30%
1962 0.00% 1.50%
1963 0.00% 0.00%
1964 0.00% 0.00%
1965 0.00% 46.20%
1966 0.00% 0.00%
1967 0.00% 1.50%
1968 1.70% 0.00%
1969 0.00% 0.00%
1970 0.00% 12.10%
1971 0.00% 0.00%
1972 0.00% 3.10%
1973 0.00% 0.00%
1974 0.00% 3.00%
1975 0.00% 35.40%
1976 0.00% 0.00%
1977 98.50% 0.00%
1978 0.00% 1.70%
1979 0.00% 46.80%
1980 9.00% 0.00%
1981 30.00% 0.00%
1982 0.00% 0.00%
1983 0.00% 32.70%
1984 0.00% 29.70%
1985 73.20% 0.00%
1986 18.80% 0.00%
1987 96.70% 0.00%
1988 54.00% 0.00%
1989 0.00% 0.00%
1990 0.00% 0.00%
1991 26.80% 0.00%
1992 0.00% 1.70%
1993 0.00% 24.70%
1994 4.70% 0.00%
1995 0.00% 5.00%
1996 0.00% 69.20%
1997 0.00% 6.10%
1998 51.40% 0.00%
1999 20.50% 0.00%
2000 79.70% 0.00%
2001 0.00% 0.00%
2002 0.00% 23.20%
2003 0.00% 0.00%
2004 0.00% 0.00%
2005 0.00% 0.00%
2006 26.30% 0.00%
2007 6.30% 0.00%
2008 0.00% 1.70%
2009 0.00% 1.50%
2010 72.20% 0.00%
2011 0.00% 3.20%
2012 100.00% 0.00%
2013 0.00% 66.70%
2014 0.00% 34.50%

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.