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 3.00% 3.00%
1911 22.20% 6.50%
1912 0.90% 50.70%
1913 1.40% 28.10%
1914 5.50% 3.70%
1915 1.70% 3.30%
1916 2.40% 22.80%
1917 0.20% 67.20%
1918 2.70% 10.80%
1919 2.50% 5.20%
1920 0.40% 17.10%
1921 43.20% 0.80%
1922 11.70% 25.30%
1923 0.80% 12.00%
1924 0.00% 34.00%
1925 14.40% 0.00%
1926 12.70% 14.80%
1927 21.90% 0.80%
1928 1.70% 1.80%
1929 2.10% 43.40%
1930 0.70% 3.80%
1931 14.20% 6.80%
1932 6.20% 3.40%
1933 9.90% 23.40%
1934 34.30% 4.70%
1935 3.50% 0.50%
1936 2.20% 31.00%
1937 2.90% 32.10%
1938 26.20% 0.20%
1939 1.50% 1.90%
1940 16.60% 35.60%
1941 11.20% 3.40%
1942 0.80% 14.60%
1943 0.80% 4.50%
1944 1.00% 9.50%
1945 1.60% 1.60%
1946 11.50% 1.70%
1947 0.00% 10.50%
1948 0.30% 9.40%
1949 15.90% 24.30%
1950 7.40% 25.60%
1951 0.60% 12.10%
1952 5.50% 2.80%
1953 24.90% 0.40%
1954 3.20% 0.30%
1955 0.70% 28.30%
1956 0.00% 0.40%
1957 15.60% 0.50%
1958 10.40% 12.90%
1959 0.70% 0.40%
1960 0.50% 19.30%
1961 8.40% 2.70%
1962 0.00% 1.20%
1963 0.00% 12.50%
1964 0.00% 22.10%
1965 0.00% 7.00%
1966 0.00% 12.30%
1967 0.80% 1.50%
1968 0.20% 13.60%
1969 0.00% 5.30%
1970 0.30% 6.60%
1971 0.20% 16.10%
1972 1.10% 3.20%
1973 8.60% 6.50%
1974 5.40% 0.70%
1975 1.00% 11.50%
1976 0.30% 2.60%
1977 2.10% 5.80%
1978 14.00% 42.80%
1979 0.50% 42.20%
1980 1.10% 0.90%
1981 23.70% 2.50%
1982 0.20% 17.60%
1983 14.00% 8.00%
1984 3.90% 5.00%
1985 0.00% 4.40%
1986 48.10% 0.20%
1987 33.20% 1.30%
1988 0.30% 21.10%
1989 1.90% 0.80%
1990 35.80% 0.00%
1991 47.40% 0.60%
1992 48.70% 0.00%
1993 4.80% 0.80%
1994 8.60% 3.00%
1995 8.60% 0.00%
1996 9.30% 3.00%
1997 7.00% 0.40%
1998 49.50% 0.90%
1999 27.60% 0.50%
2000 55.30% 0.00%
2001 6.40% 0.00%
2002 10.50% 0.70%
2003 17.00% 0.60%
2004 15.60% 0.10%
2005 23.00% 0.00%
2006 51.40% 0.00%
2007 5.10% 0.40%
2008 0.70% 4.20%
2009 5.20% 0.30%
2010 15.40% 0.60%
2011 1.50% 2.90%
2012 71.90% 0.00%
2013 3.70% 1.50%
2014 12.10% 20.60%

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.