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 10.60% 0.50%
1911 26.80% 5.50%
1912 0.00% 58.30%
1913 4.80% 20.10%
1914 2.70% 3.80%
1915 0.50% 30.10%
1916 2.60% 15.80%
1917 0.30% 48.30%
1918 3.00% 1.00%
1919 6.20% 13.80%
1920 0.30% 25.60%
1921 41.30% 0.30%
1922 0.30% 19.90%
1923 0.00% 6.90%
1924 5.50% 37.10%
1925 31.10% 0.20%
1926 18.50% 12.10%
1927 9.10% 1.50%
1928 1.90% 2.70%
1929 0.30% 26.80%
1930 8.40% 0.40%
1931 28.10% 3.30%
1932 10.80% 5.40%
1933 22.10% 10.50%
1934 64.10% 0.30%
1935 0.70% 1.40%
1936 2.80% 2.50%
1937 0.60% 21.00%
1938 7.20% 1.00%
1939 8.70% 0.10%
1940 11.80% 34.10%
1941 4.80% 13.90%
1942 0.00% 6.70%
1943 6.20% 1.40%
1944 5.30% 14.40%
1945 2.60% 1.60%
1946 23.00% 0.00%
1947 0.80% 17.00%
1948 0.20% 6.60%
1949 12.60% 18.30%
1950 2.00% 22.20%
1951 0.00% 10.20%
1952 15.30% 6.00%
1953 19.90% 0.40%
1954 33.60% 1.20%
1955 1.50% 22.30%
1956 1.10% 3.30%
1957 0.70% 4.20%
1958 5.60% 38.60%
1959 5.00% 0.40%
1960 0.00% 28.60%
1961 9.00% 3.80%
1962 0.00% 3.20%
1963 1.70% 1.90%
1964 4.00% 8.30%
1965 0.00% 13.00%
1966 0.40% 8.40%
1967 1.50% 3.10%
1968 0.70% 9.90%
1969 0.00% 11.60%
1970 0.20% 4.70%
1971 0.60% 4.60%
1972 8.80% 1.60%
1973 0.30% 19.20%
1974 7.70% 0.30%
1975 0.80% 24.60%
1976 7.10% 0.00%
1977 4.50% 0.20%
1978 0.00% 44.30%
1979 0.00% 57.50%
1980 0.50% 2.30%
1981 19.80% 0.40%
1982 0.00% 18.20%
1983 0.60% 23.60%
1984 2.50% 8.10%
1985 0.60% 1.20%
1986 27.20% 0.00%
1987 28.30% 2.10%
1988 15.90% 0.70%
1989 7.10% 0.50%
1990 18.00% 0.00%
1991 17.60% 0.20%
1992 23.10% 0.60%
1993 0.00% 28.30%
1994 17.60% 0.40%
1995 1.40% 0.90%
1996 12.90% 8.40%
1997 3.70% 2.00%
1998 19.50% 5.90%
1999 13.80% 1.00%
2000 47.10% 0.00%
2001 3.00% 0.00%
2002 25.20% 0.00%
2003 18.70% 7.20%
2004 9.40% 0.00%
2005 4.80% 0.20%
2006 67.00% 0.00%
2007 22.30% 3.60%
2008 3.90% 1.90%
2009 8.20% 0.60%
2010 10.00% 1.70%
2011 16.30% 8.20%
2012 82.90% 0.10%
2013 7.90% 4.00%
2014 21.10% 18.90%

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.