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 20.70% 0.00%
1911 11.50% 0.00%
1912 1.50% 1.60%
1913 1.50% 0.00%
1914 0.00% 0.00%
1915 0.00% 21.30%
1916 0.00% 0.00%
1917 0.00% 9.30%
1918 24.10% 0.00%
1919 0.00% 0.00%
1920 0.00% 51.80%
1921 49.30% 0.00%
1922 5.10% 1.60%
1923 0.00% 11.30%
1924 0.00% 82.10%
1925 32.50% 1.50%
1926 0.00% 53.80%
1927 20.00% 0.00%
1928 0.00% 30.90%
1929 11.50% 0.00%
1930 0.00% 5.10%
1931 0.00% 95.20%
1932 0.00% 1.60%
1933 0.00% 0.00%
1934 0.00% 0.00%
1935 23.30% 1.50%
1936 11.20% 0.00%
1937 0.00% 1.70%
1938 47.20% 0.00%
1939 0.00% 0.00%
1940 0.00% 27.40%
1941 0.00% 3.40%
1942 18.60% 0.00%
1943 0.00% 0.00%
1944 1.60% 0.00%
1945 83.90% 0.00%
1946 12.60% 0.00%
1947 0.00% 22.60%
1948 30.80% 0.00%
1949 0.00% 1.70%
1950 0.00% 3.00%
1951 0.00% 0.00%
1952 0.00% 0.00%
1953 8.00% 0.00%
1954 0.00% 0.00%
1955 79.00% 0.00%
1956 0.00% 0.00%
1957 0.00% 0.00%
1958 0.00% 67.20%
1959 1.50% 0.00%
1960 0.00% 96.60%
1961 0.00% 25.30%
1962 0.00% 0.00%
1963 24.40% 0.00%
1964 0.00% 0.00%
1965 0.00% 0.00%
1966 0.00% 11.40%
1967 52.30% 0.00%
1968 0.00% 0.00%
1969 0.00% 18.50%
1970 0.00% 0.00%
1971 0.00% 35.70%
1972 0.00% 1.60%
1973 0.00% 0.00%
1974 16.50% 0.00%
1975 6.90% 6.10%
1976 12.50% 0.00%
1977 70.10% 0.00%
1978 0.00% 9.30%
1979 0.00% 0.00%
1980 0.00% 16.20%
1981 0.00% 0.00%
1982 0.00% 0.00%
1983 0.00% 77.70%
1984 0.00% 39.20%
1985 33.20% 0.00%
1986 12.90% 0.00%
1987 3.20% 6.90%
1988 0.00% 0.00%
1989 1.70% 4.70%
1990 1.70% 0.00%
1991 10.90% 0.00%
1992 0.00% 6.40%
1993 0.00% 53.90%
1994 1.70% 0.00%
1995 25.90% 0.00%
1996 0.00% 0.00%
1997 0.00% 0.00%
1998 0.00% 0.00%
1999 1.70% 0.00%
2000 40.40% 0.00%
2001 0.00% 0.00%
2002 24.70% 0.00%
2003 1.70% 0.00%
2004 47.80% 0.00%
2005 0.00% 9.60%
2006 16.50% 0.00%
2007 41.70% 0.00%
2008 1.70% 0.00%
2009 0.00% 1.60%
2010 20.20% 1.70%
2011 33.10% 0.00%
2012 95.00% 0.00%
2013 0.00% 69.20%
2014 0.00% 8.00%

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.