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% 18.40%
1911 20.10% 0.00%
1912 0.00% 81.30%
1913 4.00% 0.00%
1914 0.00% 2.60%
1915 0.00% 0.00%
1916 0.00% 15.60%
1917 0.00% 97.30%
1918 0.00% 0.00%
1919 5.40% 0.00%
1920 0.00% 9.30%
1921 96.00% 0.00%
1922 5.50% 0.00%
1923 0.00% 0.00%
1924 0.00% 90.60%
1925 1.30% 0.00%
1926 0.00% 12.80%
1927 5.40% 0.00%
1928 0.00% 2.70%
1929 0.00% 44.10%
1930 0.00% 5.30%
1931 82.60% 0.00%
1932 1.40% 1.30%
1933 17.50% 0.00%
1934 1.30% 0.00%
1935 0.00% 0.00%
1936 0.00% 2.50%
1937 0.00% 3.90%
1938 40.70% 0.00%
1939 2.60% 0.00%
1940 0.00% 48.00%
1941 28.80% 0.00%
1942 0.00% 0.00%
1943 0.00% 7.90%
1944 0.00% 1.40%
1945 0.00% 1.30%
1946 14.50% 0.00%
1947 0.00% 4.10%
1948 0.00% 0.00%
1949 9.50% 0.00%
1950 0.00% 37.70%
1951 0.00% 20.80%
1952 0.00% 1.30%
1953 0.00% 0.00%
1954 18.40% 0.00%
1955 0.00% 0.00%
1956 0.00% 0.00%
1957 4.10% 0.00%
1958 0.00% 46.40%
1959 0.00% 0.00%
1960 0.00% 22.80%
1961 0.00% 1.30%
1962 0.00% 1.30%
1963 0.00% 69.90%
1964 0.00% 0.00%
1965 0.00% 0.00%
1966 0.00% 30.50%
1967 0.00% 1.30%
1968 0.00% 10.90%
1969 0.00% 8.10%
1970 0.00% 0.00%
1971 0.00% 0.00%
1972 0.00% 0.00%
1973 63.80% 0.00%
1974 0.00% 0.00%
1975 2.70% 0.00%
1976 0.00% 88.30%
1977 0.00% 0.00%
1978 0.00% 74.70%
1979 0.00% 60.40%
1980 0.00% 3.90%
1981 0.00% 5.30%
1982 0.00% 0.00%
1983 0.00% 0.00%
1984 0.00% 0.00%
1985 0.00% 0.00%
1986 25.20% 0.00%
1987 40.10% 0.00%
1988 0.00% 20.20%
1989 0.00% 23.50%
1990 60.20% 0.00%
1991 72.60% 0.00%
1992 0.00% 0.00%
1993 0.00% 1.30%
1994 0.00% 0.00%
1995 0.00% 0.00%
1996 0.00% 13.00%
1997 0.00% 1.30%
1998 98.70% 0.00%
1999 9.30% 0.00%
2000 0.00% 0.00%
2001 29.60% 0.00%
2002 47.40% 0.00%
2003 0.00% 0.00%
2004 12.10% 0.00%
2005 29.20% 0.00%
2006 78.50% 0.00%
2007 33.50% 0.00%
2008 0.00% 1.30%
2009 0.00% 0.00%
2010 1.30% 0.00%
2011 36.90% 0.00%
2012 94.70% 0.00%
2013 2.60% 3.90%

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.