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% 35.50%
1911 4.50% 8.30%
1912 7.80% 4.00%
1913 18.40% 14.90%
1914 45.20% 10.70%
1915 3.50% 22.00%
1916 0.00% 12.50%
1917 0.00% 25.30%
1918 6.70% 0.00%
1919 3.70% 13.60%
1920 3.70% 22.20%
1921 34.00% 3.50%
1922 0.00% 21.80%
1923 12.70% 3.30%
1924 0.00% 49.90%
1925 12.60% 0.00%
1926 0.00% 20.60%
1927 23.60% 0.00%
1928 6.30% 16.70%
1929 3.20% 6.40%
1930 20.40% 6.60%
1931 16.90% 9.30%
1932 0.00% 0.00%
1933 6.70% 3.00%
1934 0.00% 6.50%
1935 0.00% 9.20%
1936 16.70% 10.20%
1937 0.00% 7.00%
1938 3.10% 9.80%
1939 3.50% 49.40%
1940 0.00% 10.30%
1941 9.80% 0.00%
1942 0.00% 26.90%
1943 3.40% 6.80%
1944 0.00% 27.80%
1945 12.90% 0.00%
1946 10.10% 3.10%
1947 3.40% 0.00%
1948 0.00% 16.90%
1949 10.20% 3.50%
1950 3.40% 9.40%
1951 19.30% 0.00%
1952 0.00% 0.00%
1953 6.90% 3.50%
1954 9.80% 6.20%
1955 22.80% 0.00%
1956 0.00% 9.70%
1957 25.80% 0.00%
1958 6.70% 13.60%
1959 23.50% 0.00%
1960 0.00% 15.90%
1961 26.10% 0.00%
1962 0.00% 19.60%
1963 15.50% 0.00%
1964 0.00% 10.20%
1965 31.30% 3.40%
1966 6.80% 6.20%
1967 44.40% 0.00%
1968 10.00% 0.00%
1969 3.50% 0.00%
1970 9.30% 9.90%
1971 3.30% 6.20%
1972 10.50% 0.00%
1973 0.00% 3.60%
1974 0.00% 12.60%
1975 0.00% 20.30%
1976 0.00% 16.90%
1977 0.00% 0.00%
1978 0.00% 27.50%
1979 0.00% 17.40%
1980 0.00% 27.10%
1981 15.80% 6.10%
1982 10.00% 3.50%
1983 29.60% 3.50%
1984 58.20% 0.00%
1985 0.00% 20.50%
1986 32.50% 6.50%
1987 3.30% 3.50%
1988 34.20% 3.40%
1989 0.00% 7.10%
1990 10.10% 0.00%
1991 16.10% 13.30%
1992 22.80% 0.00%
1993 6.40% 13.20%
1994 0.00% 16.60%
1995 6.20% 10.10%
1996 19.40% 6.40%
1997 6.50% 3.70%
1998 16.10% 6.90%
1999 36.80% 0.00%
2000 17.50% 0.00%
2001 3.80% 0.00%
2002 0.00% 42.80%
2003 0.00% 3.30%
2004 9.60% 0.00%
2005 6.70% 7.10%
2006 18.70% 0.00%
2007 0.00% 7.30%
2008 8.10% 3.80%
2009 4.00% 4.30%
2010 0.00% 3.70%
2011 0.00% 5.00%
2012 8.30% 15.50%
2013 9.30% 0.00%
2014 12.00% 0.00%
2015 19.00% 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.