U.S. Climate Extremes Index (CEI): Graph

NCEI added Alaska climate divisions to its nClimDiv dataset on Friday, March 6, 2015, coincident with the release of the February 2015 monthly monitoring report. For more information on this data, please visit the Alaska Climate Divisions FAQ.

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: xml csv json
Year Wet Dry
1910 9.40% 14.90%
1911 13.80% 11.60%
1912 9.30% 6.00%
1913 3.90% 27.10%
1914 5.80% 8.90%
1915 29.80% 10.70%
1916 8.30% 12.30%
1917 2.20% 23.90%
1918 0.00% 16.80%
1919 22.30% 6.70%
1920 8.20% 0.00%
1921 6.80% 3.60%
1922 2.50% 15.50%
1923 7.00% 7.10%
1924 1.10% 34.40%
1925 0.00% 12.10%
1926 2.20% 6.50%
1927 11.90% 0.00%
1928 26.50% 4.60%
1929 0.00% 16.10%
1930 0.00% 34.80%
1931 5.70% 8.70%
1932 4.50% 2.30%
1933 1.10% 5.50%
1934 0.00% 40.70%
1935 6.80% 5.20%
1936 0.00% 50.40%
1937 4.60% 2.30%
1938 1.10% 5.40%
1939 4.40% 1.10%
1940 22.90% 1.10%
1941 24.00% 0.00%
1942 15.60% 0.00%
1943 0.00% 25.00%
1944 3.20% 4.70%
1945 10.40% 4.70%
1946 1.20% 11.60%
1947 0.00% 18.00%
1948 11.00% 10.50%
1949 23.50% 0.00%
1950 35.40% 0.00%
1951 20.00% 5.80%
1952 0.00% 22.80%
1953 0.00% 10.60%
1954 1.00% 39.70%
1955 8.90% 2.00%
1956 1.00% 20.40%
1957 2.20% 5.60%
1958 11.10% 3.50%
1959 28.90% 0.00%
1960 11.00% 1.00%
1961 19.00% 0.00%
1962 13.70% 0.00%
1963 1.10% 3.40%
1964 2.30% 6.90%
1965 11.40% 5.60%
1966 2.10% 4.30%
1967 10.40% 3.40%
1968 12.60% 0.00%
1969 3.10% 5.50%
1970 2.10% 9.90%
1971 18.70% 1.00%
1972 6.70% 0.00%
1973 19.00% 0.00%
1974 6.90% 4.30%
1975 25.60% 4.20%
1976 9.00% 26.00%
1977 4.20% 0.00%
1978 1.10% 4.20%
1979 16.30% 0.00%
1980 0.00% 60.30%
1981 14.50% 4.30%
1982 4.50% 6.20%
1983 3.50% 13.10%
1984 5.60% 8.50%
1985 3.30% 4.50%
1986 6.80% 0.00%
1987 8.00% 0.00%
1988 2.30% 6.40%
1989 36.10% 0.00%
1990 0.00% 9.70%
1991 13.60% 2.10%
1992 38.10% 1.20%
1993 13.30% 5.50%
1994 3.50% 9.20%
1995 0.00% 3.40%
1996 46.50% 0.00%
1997 7.70% 1.20%
1998 1.10% 12.00%
1999 2.40% 5.40%
2000 0.00% 13.90%
2001 3.40% 9.60%
2002 2.40% 5.40%
2003 18.50% 1.00%
2004 37.00% 0.00%
2005 5.70% 3.40%
2006 7.90% 10.30%
2007 37.60% 5.70%
2008 10.00% 1.10%
2009 15.00% 11.70%
2010 7.10% 5.60%
2011 1.10% 50.70%
2012 2.40% 19.00%
2013 3.60% 2.50%
2014 6.10% 2.60%
2015 1.60% 6.30%

*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.