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% 9.90%
1911 3.10% 5.00%
1912 0.00% 3.20%
1913 3.10% 15.20%
1914 22.70% 0.00%
1915 0.00% 7.90%
1916 1.50% 3.40%
1917 0.00% 25.90%
1918 0.00% 35.80%
1919 1.60% 1.60%
1920 0.00% 14.60%
1921 12.90% 1.70%
1922 1.50% 3.20%
1923 1.60% 1.60%
1924 0.00% 1.50%
1925 3.20% 1.50%
1926 3.20% 3.30%
1927 0.00% 30.00%
1928 1.60% 3.40%
1929 0.00% 44.80%
1930 0.00% 44.70%
1931 1.60% 5.00%
1932 24.60% 0.00%
1933 1.60% 1.70%
1934 68.70% 0.00%
1935 0.00% 0.00%
1936 6.50% 1.70%
1937 0.00% 0.00%
1938 0.00% 5.20%
1939 11.20% 3.40%
1940 0.00% 0.00%
1941 21.00% 0.00%
1942 9.30% 0.00%
1943 41.40% 0.00%
1944 1.70% 0.00%
1945 1.70% 6.20%
1946 0.00% 31.60%
1947 0.00% 24.40%
1948 0.00% 3.20%
1949 28.50% 0.00%
1950 0.00% 20.70%
1951 1.60% 0.00%
1952 23.80% 0.00%
1953 0.00% 0.00%
1954 3.20% 6.20%
1955 0.00% 16.70%
1956 0.00% 9.90%
1957 0.00% 0.00%
1958 0.00% 0.00%
1959 1.70% 0.00%
1960 0.00% 1.50%
1961 1.70% 61.80%
1962 1.70% 14.00%
1963 0.00% 39.50%
1964 0.00% 3.20%
1965 0.00% 17.80%
1966 0.00% 54.90%
1967 1.70% 83.90%
1968 0.00% 6.50%
1969 1.70% 4.90%
1970 0.00% 6.50%
1971 0.00% 1.70%
1972 0.00% 80.60%
1973 4.60% 1.60%
1974 0.00% 52.10%
1975 3.10% 4.90%
1976 0.00% 82.00%
1977 0.00% 0.00%
1978 3.20% 3.30%
1979 0.00% 20.80%
1980 6.50% 3.20%
1981 14.80% 0.00%
1982 0.00% 4.70%
1983 0.00% 3.20%
1984 0.00% 14.80%
1985 0.00% 0.00%
1986 29.30% 0.00%
1987 33.70% 0.00%
1988 0.00% 6.40%
1989 23.60% 1.70%
1990 5.00% 1.60%
1991 36.90% 0.00%
1992 0.00% 1.50%
1993 32.30% 0.00%
1994 15.70% 0.00%
1995 33.50% 0.00%
1996 0.00% 0.00%
1997 0.00% 11.10%
1998 54.10% 0.00%
1999 28.20% 0.00%
2000 0.00% 1.70%
2001 0.00% 1.50%
2002 17.10% 0.00%
2003 14.60% 0.00%
2004 8.30% 0.00%
2005 96.70% 0.00%
2006 17.40% 0.00%
2007 26.30% 0.00%
2008 8.30% 1.50%
2009 20.10% 0.00%
2010 98.50% 0.00%
2011 84.00% 0.00%
2012 10.00% 0.00%
2013 45.10% 0.00%

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.