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 0.00% 16.50%
1911 5.10% 14.90%
1912 30.40% 11.30%
1913 2.60% 12.50%
1914 5.20% 26.70%
1915 4.50% 23.30%
1916 6.80% 15.30%
1917 4.30% 17.90%
1918 2.40% 11.10%
1919 11.60% 11.10%
1920 4.40% 2.20%
1921 0.00% 19.80%
1922 20.70% 4.70%
1923 6.70% 15.50%
1924 4.50% 6.50%
1925 0.00% 23.70%
1926 4.50% 4.20%
1927 6.40% 15.70%
1928 16.00% 0.00%
1929 36.30% 0.00%
1930 4.40% 10.40%
1931 0.00% 17.10%
1932 23.40% 0.00%
1933 0.00% 12.30%
1934 4.20% 6.10%
1935 2.10% 6.50%
1936 13.60% 2.30%
1937 28.30% 0.00%
1938 2.00% 18.90%
1939 6.40% 6.40%
1940 2.00% 14.20%
1941 2.30% 35.20%
1942 2.00% 5.90%
1943 0.00% 49.60%
1944 6.60% 2.10%
1945 6.10% 0.00%
1946 8.40% 4.20%
1947 25.60% 2.00%
1948 23.80% 0.00%
1949 16.70% 0.00%
1950 8.00% 10.40%
1951 0.00% 21.80%
1952 0.00% 14.60%
1953 16.70% 13.90%
1954 0.00% 49.80%
1955 0.00% 18.50%
1956 0.00% 17.20%
1957 34.50% 0.00%
1958 10.40% 6.00%
1959 30.50% 2.00%
1960 6.30% 8.10%
1961 14.20% 10.50%
1962 6.10% 2.00%
1963 0.00% 14.90%
1964 17.10% 2.00%
1965 2.20% 4.30%
1966 4.20% 3.90%
1967 0.00% 8.60%
1968 0.00% 12.10%
1969 4.60% 6.40%
1970 4.20% 13.00%
1971 24.70% 2.20%
1972 25.10% 4.40%
1973 14.10% 4.80%
1974 25.00% 4.40%
1975 46.70% 0.00%
1976 2.20% 6.20%
1977 2.20% 4.10%
1978 0.00% 11.20%
1979 2.10% 0.00%
1980 0.00% 4.00%
1981 0.00% 22.80%
1982 28.10% 2.20%
1983 8.90% 2.10%
1984 0.00% 17.00%
1985 0.00% 14.50%
1986 2.20% 8.20%
1987 2.20% 6.20%
1988 2.10% 8.00%
1989 39.90% 2.10%
1990 2.00% 23.80%
1991 23.80% 4.20%
1992 31.80% 2.10%
1993 2.10% 8.40%
1994 26.60% 2.00%
1995 4.20% 6.40%
1996 16.10% 8.60%
1997 6.30% 4.30%
1998 4.10% 10.60%
1999 0.00% 12.90%
2000 2.00% 19.50%
2001 2.00% 11.90%
2002 8.40% 2.30%
2003 40.60% 0.00%
2004 17.10% 0.00%
2005 4.60% 0.00%
2006 2.00% 26.40%
2007 0.00% 40.50%
2008 2.20% 4.30%
2009 34.10% 2.20%
2010 0.00% 30.90%
2011 4.70% 7.40%
2012 5.40% 0.00%
2013 40.20% 0.00%
2014 28.00% 8.60%
2015 35.50% 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.

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.