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% 52.50%
1911 3.80% 24.70%
1912 25.00% 3.30%
1913 0.00% 44.50%
1914 3.30% 9.70%
1915 24.20% 0.00%
1916 0.00% 9.50%
1917 6.20% 0.00%
1918 0.00% 18.60%
1919 16.10% 2.90%
1920 15.10% 3.00%
1921 3.20% 6.00%
1922 3.00% 2.90%
1923 2.90% 2.80%
1924 9.90% 0.00%
1925 0.00% 14.40%
1926 60.80% 0.00%
1927 0.00% 16.50%
1928 12.40% 3.30%
1929 0.00% 8.60%
1930 0.00% 6.00%
1931 0.00% 0.00%
1932 0.00% 12.20%
1933 0.00% 21.90%
1934 0.00% 23.60%
1935 14.60% 0.00%
1936 0.00% 17.10%
1937 0.00% 2.80%
1938 14.90% 3.20%
1939 0.00% 6.00%
1940 0.00% 8.80%
1941 74.20% 0.00%
1942 0.00% 0.00%
1943 0.00% 3.20%
1944 17.20% 0.00%
1945 6.30% 0.00%
1946 8.60% 2.80%
1947 11.80% 6.30%
1948 0.00% 9.50%
1949 6.00% 0.00%
1950 0.00% 17.60%
1951 3.20% 0.00%
1952 27.90% 0.00%
1953 2.90% 0.00%
1954 0.00% 2.80%
1955 2.80% 24.40%
1956 0.00% 30.50%
1957 40.60% 0.00%
1958 49.50% 0.00%
1959 2.80% 24.00%
1960 0.00% 3.20%
1961 5.70% 0.00%
1962 0.00% 5.80%
1963 2.70% 11.50%
1964 8.70% 0.00%
1965 23.90% 0.00%
1966 0.00% 64.10%
1967 0.00% 6.00%
1968 9.30% 0.00%
1969 2.80% 8.50%
1970 0.00% 0.00%
1971 0.00% 18.90%
1972 0.00% 52.00%
1973 40.10% 0.00%
1974 0.00% 28.50%
1975 21.90% 0.00%
1976 0.00% 0.00%
1977 0.00% 3.00%
1978 22.70% 3.10%
1979 16.00% 3.10%
1980 19.20% 0.00%
1981 15.20% 0.00%
1982 7.50% 0.00%
1983 34.10% 0.00%
1984 0.00% 6.00%
1985 11.90% 0.00%
1986 5.90% 0.00%
1987 26.00% 0.00%
1988 0.00% 3.10%
1989 0.00% 27.70%
1990 8.80% 0.00%
1991 5.80% 3.10%
1992 54.60% 8.40%
1993 8.70% 0.00%
1994 6.20% 3.00%
1995 46.70% 0.00%
1996 2.90% 25.50%
1997 0.00% 0.00%
1998 5.80% 2.90%
1999 5.90% 0.00%
2000 0.00% 0.00%
2001 0.00% 0.00%
2002 0.00% 47.50%
2003 0.00% 3.30%
2004 3.20% 0.00%
2005 3.10% 0.00%
2006 0.00% 3.00%
2007 9.00% 5.70%
2008 0.00% 13.50%
2009 3.10% 3.30%
2010 3.30% 0.00%
2011 22.70% 5.00%
2012 0.00% 38.60%
2013 3.60% 15.10%
2014 3.90% 3.90%
2015 17.20% 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.