U.S. Climate Extremes Index (CEI)
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.
| Year | Wet | Dry |
|---|---|---|
| 1910 | 8.80% | 14.00% |
| 1911 | 14.50% | 11.20% |
| 1912 | 8.80% | 5.60% |
| 1913 | 3.60% | 27.40% |
| 1914 | 5.40% | 10.60% |
| 1915 | 29.90% | 11.20% |
| 1916 | 8.90% | 13.70% |
| 1917 | 2.00% | 23.50% |
| 1918 | 0.00% | 18.10% |
| 1919 | 21.30% | 6.40% |
| 1920 | 7.70% | 1.00% |
| 1921 | 7.50% | 3.40% |
| 1922 | 2.30% | 14.60% |
| 1923 | 7.80% | 7.90% |
| 1924 | 1.00% | 33.70% |
| 1925 | 0.00% | 11.30% |
| 1926 | 2.10% | 6.10% |
| 1927 | 12.50% | 0.00% |
| 1928 | 24.80% | 4.30% |
| 1929 | 0.00% | 16.20% |
| 1930 | 0.00% | 34.00% |
| 1931 | 6.40% | 9.20% |
| 1932 | 4.30% | 2.20% |
| 1933 | 2.20% | 6.10% |
| 1934 | 0.00% | 43.30% |
| 1935 | 6.50% | 6.00% |
| 1936 | 0.00% | 51.30% |
| 1937 | 4.30% | 2.20% |
| 1938 | 1.10% | 5.10% |
| 1939 | 4.20% | 1.00% |
| 1940 | 18.50% | 1.00% |
| 1941 | 24.50% | 0.00% |
| 1942 | 15.70% | 0.00% |
| 1943 | 0.00% | 24.60% |
| 1944 | 3.00% | 4.40% |
| 1945 | 10.90% | 4.50% |
| 1946 | 1.20% | 13.10% |
| 1947 | 0.00% | 17.40% |
| 1948 | 12.40% | 9.80% |
| 1949 | 23.40% | 0.00% |
| 1950 | 36.70% | 0.00% |
| 1951 | 19.80% | 5.40% |
| 1952 | 0.00% | 20.30% |
| 1953 | 0.00% | 10.00% |
| 1954 | 1.00% | 38.20% |
| 1955 | 8.30% | 1.90% |
| 1956 | 1.00% | 19.10% |
| 1957 | 2.10% | 5.30% |
| 1958 | 9.30% | 3.30% |
| 1959 | 27.20% | 1.00% |
| 1960 | 11.40% | 1.00% |
| 1961 | 17.90% | 0.00% |
| 1962 | 12.80% | 0.00% |
| 1963 | 1.00% | 4.20% |
| 1964 | 2.10% | 6.40% |
| 1965 | 11.70% | 5.30% |
| 1966 | 3.00% | 3.10% |
| 1967 | 9.80% | 3.10% |
| 1968 | 11.80% | 0.00% |
| 1969 | 2.90% | 6.20% |
| 1970 | 2.00% | 9.20% |
| 1971 | 17.50% | 1.00% |
| 1972 | 7.50% | 1.10% |
| 1973 | 18.90% | 0.00% |
| 1974 | 6.40% | 4.10% |
| 1975 | 25.30% | 3.90% |
| 1976 | 9.50% | 26.40% |
| 1977 | 4.90% | 0.00% |
| 1978 | 1.00% | 4.90% |
| 1979 | 16.50% | 0.00% |
| 1980 | 0.00% | 61.80% |
| 1981 | 15.70% | 5.00% |
| 1982 | 4.20% | 6.90% |
| 1983 | 3.40% | 12.70% |
| 1984 | 5.20% | 9.00% |
| 1985 | 3.10% | 4.20% |
| 1986 | 7.50% | 0.00% |
| 1987 | 7.50% | 0.00% |
| 1988 | 2.20% | 5.00% |
| 1989 | 34.90% | 0.00% |
| 1990 | 0.00% | 9.20% |
| 1991 | 12.70% | 2.00% |
| 1992 | 36.70% | 1.20% |
| 1993 | 13.50% | 4.10% |
| 1994 | 3.30% | 8.70% |
| 1995 | 1.10% | 3.20% |
| 1996 | 45.70% | 0.00% |
| 1997 | 6.20% | 1.10% |
| 1998 | 1.00% | 13.50% |
| 1999 | 3.20% | 5.10% |
| 2000 | 0.00% | 13.00% |
| 2001 | 3.20% | 10.10% |
| 2002 | 3.40% | 5.10% |
| 2003 | 19.50% | 2.00% |
| 2004 | 36.70% | 0.00% |
| 2005 | 5.40% | 3.20% |
| 2006 | 7.50% | 10.80% |
| 2007 | 37.50% | 6.60% |
| 2008 | 12.00% | 1.10% |
| 2009 | 14.60% | 12.60% |
| 2010 | 6.90% | 4.40% |
| 2011 | 1.10% | 48.40% |
| 2012 | 3.50% | 7.80% |
*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.
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.
