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 11.10% 2.00%
1911 25.50% 11.20%
1912 0.00% 71.30%
1913 4.20% 18.60%
1914 1.10% 4.40%
1915 0.50% 37.10%
1916 1.10% 17.70%
1917 0.40% 46.00%
1918 1.00% 3.00%
1919 7.20% 14.50%
1920 0.40% 25.80%
1921 41.60% 0.80%
1922 0.90% 9.70%
1923 0.00% 11.20%
1924 3.80% 34.80%
1925 31.40% 0.40%
1926 11.30% 10.80%
1927 6.90% 6.20%
1928 1.90% 5.40%
1929 0.20% 24.60%
1930 13.70% 0.90%
1931 29.30% 2.30%
1932 8.90% 4.80%
1933 24.90% 8.80%
1934 61.60% 0.10%
1935 0.90% 0.70%
1936 8.10% 1.10%
1937 1.10% 8.30%
1938 11.50% 1.00%
1939 19.10% 0.00%
1940 9.60% 32.70%
1941 1.70% 13.90%
1942 0.30% 4.70%
1943 8.90% 1.20%
1944 3.60% 8.00%
1945 2.60% 2.60%
1946 10.70% 0.20%
1947 0.60% 2.60%
1948 0.40% 8.10%
1949 6.40% 14.90%
1950 1.00% 24.30%
1951 1.40% 20.30%
1952 14.40% 2.40%
1953 23.10% 0.40%
1954 39.40% 4.30%
1955 6.20% 16.80%
1956 9.60% 5.10%
1957 0.30% 4.10%
1958 5.40% 35.00%
1959 2.70% 0.30%
1960 0.70% 20.90%
1961 4.60% 3.10%
1962 0.20% 3.80%
1963 1.60% 2.80%
1964 0.30% 13.30%
1965 0.00% 33.70%
1966 0.60% 12.60%
1967 3.10% 0.90%
1968 0.30% 11.90%
1969 0.20% 7.60%
1970 0.70% 2.50%
1971 0.00% 3.10%
1972 4.00% 3.20%
1973 1.00% 20.30%
1974 0.70% 1.10%
1975 0.70% 24.60%
1976 7.70% 1.30%
1977 0.70% 0.50%
1978 0.00% 33.50%
1979 0.00% 52.70%
1980 1.10% 2.30%
1981 19.70% 0.50%
1982 0.20% 24.60%
1983 1.40% 13.90%
1984 3.10% 9.40%
1985 0.00% 3.10%
1986 9.30% 0.00%
1987 26.80% 2.50%
1988 19.50% 0.90%
1989 6.30% 5.30%
1990 20.30% 0.00%
1991 13.00% 0.60%
1992 21.70% 1.70%
1993 0.00% 32.00%
1994 24.60% 2.00%
1995 0.90% 0.30%
1996 10.60% 9.80%
1997 4.20% 1.40%
1998 25.70% 4.40%
1999 13.90% 1.40%
2000 49.70% 0.00%
2001 10.80% 0.10%
2002 30.20% 0.00%
2003 24.80% 7.50%
2004 6.70% 0.30%
2005 8.90% 0.50%
2006 50.60% 0.30%
2007 30.10% 3.10%
2008 3.00% 2.20%
2009 13.60% 0.50%
2010 10.20% 1.50%
2011 20.90% 2.70%
2012 84.90% 0.00%
2013 7.00% 4.30%
2014 18.20% 18.40%

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.