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% 61.10%
1911 0.00% 15.80%
1912 2.40% 9.30%
1913 6.70% 6.80%
1914 0.00% 14.90%
1915 2.30% 17.30%
1916 9.80% 0.00%
1917 0.00% 26.30%
1918 0.00% 4.20%
1919 0.00% 2.20%
1920 2.30% 17.80%
1921 2.30% 4.50%
1922 2.20% 6.40%
1923 0.00% 25.10%
1924 4.60% 4.70%
1925 0.00% 47.70%
1926 0.00% 44.20%
1927 32.10% 0.00%
1928 0.00% 37.90%
1929 0.00% 9.00%
1930 0.00% 11.90%
1931 0.00% 28.80%
1932 0.00% 12.70%
1933 4.40% 10.80%
1934 0.00% 65.60%
1935 2.20% 6.60%
1936 6.20% 18.00%
1937 13.10% 8.40%
1938 23.60% 4.40%
1939 0.00% 41.00%
1940 4.30% 0.00%
1941 10.80% 6.80%
1942 9.70% 2.50%
1943 0.00% 5.00%
1944 35.20% 2.20%
1945 2.40% 6.90%
1946 4.90% 13.90%
1947 21.10% 0.00%
1948 0.00% 8.20%
1949 0.00% 21.50%
1950 10.60% 4.40%
1951 35.00% 0.00%
1952 0.00% 8.30%
1953 12.70% 2.20%
1954 2.00% 2.10%
1955 0.00% 12.70%
1956 12.50% 6.50%
1957 4.50% 4.30%
1958 0.00% 51.40%
1959 0.00% 6.40%
1960 15.10% 2.10%
1961 0.00% 2.00%
1962 6.10% 8.50%
1963 4.20% 6.60%
1964 0.00% 2.10%
1965 48.50% 0.00%
1966 4.10% 8.70%
1967 0.00% 15.10%
1968 8.20% 2.10%
1969 0.00% 8.00%
1970 10.40% 2.10%
1971 2.00% 19.00%
1972 4.10% 0.00%
1973 32.40% 0.00%
1974 19.80% 0.00%
1975 2.10% 0.00%
1976 4.30% 4.10%
1977 10.40% 0.00%
1978 0.00% 4.00%
1979 22.70% 0.00%
1980 0.00% 29.90%
1981 2.00% 12.80%
1982 28.20% 0.00%
1983 23.50% 0.00%
1984 19.70% 8.00%
1985 8.60% 0.00%
1986 8.50% 2.20%
1987 0.00% 6.40%
1988 0.00% 35.70%
1989 4.00% 14.80%
1990 13.00% 2.00%
1991 29.50% 0.00%
1992 2.30% 4.40%
1993 19.20% 1.90%
1994 0.00% 28.50%
1995 21.30% 0.00%
1996 0.00% 6.40%
1997 6.40% 4.40%
1998 18.00% 2.20%
1999 8.70% 0.00%
2000 10.90% 0.00%
2001 31.30% 0.00%
2002 23.40% 0.00%
2003 8.60% 0.00%
2004 43.50% 0.00%
2005 6.00% 2.20%
2006 14.70% 0.00%
2007 15.00% 0.00%
2008 2.20% 0.00%
2009 2.00% 0.00%
2010 2.30% 4.40%
2011 39.40% 0.00%
2012 24.20% 0.00%
2013 49.10% 0.00%
2014 5.80% 0.00%

*As of September 2005, the fourth and fifth indicators are computed with data from one station per each grid box rather than multiple stations. This was done to eliminate many of the artificial extremes which resulted from a changing number of available stations over time. Therefore, the percentages in the step 4 and 5 graphs above will likely be significantly different from the percentages calculated prior to the changes implemented in September 2005.

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.