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: Wet Data | Dry Data
Year Wet Dry
1910 0.00% 4.50%
1911 0.00% 7.00%
1912 15.90% 0.00%
1913 5.00% 0.00%
1914 5.00% 0.00%
1915 51.40% 0.00%
1916 44.20% 0.00%
1917 37.40% 0.00%
1918 0.00% 5.20%
1919 24.20% 0.00%
1920 63.40% 0.00%
1921 8.30% 0.00%
1922 5.20% 0.00%
1923 6.50% 0.00%
1924 20.40% 0.00%
1925 0.00% 29.50%
1926 0.00% 0.00%
1927 2.40% 0.00%
1928 9.10% 0.00%
1929 9.10% 0.00%
1930 0.00% 0.00%
1931 9.60% 1.30%
1932 14.60% 0.00%
1933 0.00% 0.00%
1934 0.00% 38.70%
1935 0.00% 26.30%
1936 0.00% 8.70%
1937 3.10% 2.00%
1938 0.00% 0.00%
1939 0.00% 0.00%
1940 0.00% 15.90%
1941 64.20% 0.00%
1942 70.50% 0.00%
1943 8.70% 0.00%
1944 8.70% 0.00%
1945 0.00% 0.00%
1946 0.00% 1.80%
1947 0.00% 3.40%
1948 13.40% 0.00%
1949 0.00% 0.00%
1950 0.00% 8.60%
1951 0.00% 31.60%
1952 15.20% 5.20%
1953 0.00% 5.20%
1954 0.00% 36.80%
1955 0.00% 30.60%
1956 0.00% 30.70%
1957 0.00% 19.60%
1958 31.50% 0.00%
1959 2.00% 19.60%
1960 0.00% 4.10%
1961 3.50% 13.90%
1962 0.00% 0.00%
1963 0.00% 23.80%
1964 0.00% 8.10%
1965 1.30% 7.20%
1966 0.00% 0.00%
1967 0.00% 20.00%
1968 0.00% 0.00%
1969 0.00% 0.00%
1970 6.80% 0.00%
1971 1.30% 7.80%
1972 0.00% 18.20%
1973 61.70% 0.00%
1974 0.00% 9.90%
1975 5.20% 0.00%
1976 0.00% 0.00%
1977 0.00% 32.30%
1978 5.40% 2.00%
1979 48.60% 0.00%
1980 52.80% 0.00%
1981 0.00% 4.40%
1982 4.00% 0.00%
1983 54.20% 0.00%
1984 36.20% 0.00%
1985 54.70% 0.00%
1986 13.00% 0.00%
1987 28.60% 0.00%
1988 0.00% 0.00%
1989 0.00% 5.10%
1990 0.00% 48.20%
1991 0.00% 0.00%
1992 33.20% 0.00%
1993 42.50% 0.00%
1994 0.00% 0.00%
1995 8.70% 0.00%
1996 0.00% 56.50%
1997 0.00% 10.80%
1998 17.80% 0.00%
1999 2.70% 0.00%
2000 0.00% 20.00%
2001 3.50% 9.10%
2002 0.00% 75.60%
2003 0.00% 34.90%
2004 0.00% 37.40%
2005 52.20% 0.00%
2006 0.00% 44.80%
2007 2.30% 21.70%
2008 0.00% 0.00%
2009 0.00% 0.00%
2010 2.00% 0.00%
2011 13.30% 23.00%
2012 0.00% 46.40%
2013 0.00% 82.60%

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.