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% 27.50%
1911 1.30% 16.10%
1912 10.20% 0.00%
1913 0.00% 30.50%
1914 15.50% 10.10%
1915 13.80% 7.10%
1916 0.00% 37.00%
1917 0.00% 11.10%
1918 0.00% 22.90%
1919 3.40% 1.10%
1920 0.00% 12.70%
1921 0.00% 26.40%
1922 18.50% 0.00%
1923 15.60% 3.50%
1924 4.30% 3.30%
1925 0.00% 40.40%
1926 9.30% 3.20%
1927 9.70% 17.90%
1928 1.10% 12.00%
1929 16.10% 0.00%
1930 2.30% 1.10%
1931 5.80% 4.80%
1932 0.00% 14.10%
1933 2.10% 10.50%
1934 2.30% 15.70%
1935 6.40% 1.10%
1936 4.60% 16.10%
1937 0.00% 5.50%
1938 9.20% 1.10%
1939 0.00% 10.80%
1940 0.00% 5.20%
1941 39.90% 2.10%
1942 3.30% 2.30%
1943 5.30% 3.20%
1944 22.80% 0.00%
1945 11.40% 2.10%
1946 2.20% 4.40%
1947 30.60% 0.00%
1948 0.00% 5.50%
1949 15.90% 1.10%
1950 6.80% 7.50%
1951 4.20% 4.30%
1952 8.40% 2.20%
1953 7.30% 2.10%
1954 0.00% 7.60%
1955 0.00% 12.90%
1956 0.00% 24.60%
1957 75.60% 0.00%
1958 30.50% 0.00%
1959 2.20% 2.20%
1960 1.20% 12.20%
1961 10.80% 18.60%
1962 0.00% 22.40%
1963 0.00% 13.50%
1964 3.40% 4.30%
1965 11.30% 3.20%
1966 4.60% 27.30%
1967 1.10% 11.90%
1968 27.90% 3.10%
1969 7.60% 1.00%
1970 7.60% 0.00%
1971 0.00% 21.80%
1972 0.00% 11.80%
1973 46.60% 1.20%
1974 0.00% 16.40%
1975 28.00% 0.00%
1976 15.50% 0.00%
1977 6.20% 6.40%
1978 4.30% 7.90%
1979 22.80% 0.00%
1980 18.20% 1.00%
1981 8.80% 1.10%
1982 15.90% 0.00%
1983 17.10% 1.20%
1984 12.20% 9.50%
1985 3.40% 0.00%
1986 2.30% 3.20%
1987 9.00% 8.80%
1988 0.00% 8.60%
1989 0.00% 8.40%
1990 40.90% 0.00%
1991 29.10% 3.30%
1992 8.00% 2.10%
1993 26.10% 0.00%
1994 6.80% 7.50%
1995 37.50% 0.00%
1996 0.00% 36.00%
1997 23.80% 2.20%
1998 0.00% 24.70%
1999 6.50% 1.10%
2000 4.30% 3.40%
2001 2.20% 5.40%
2002 1.10% 17.20%
2003 1.10% 23.40%
2004 4.50% 4.20%
2005 3.40% 12.50%
2006 0.00% 16.90%
2007 29.90% 11.50%
2008 0.00% 5.70%
2009 5.70% 1.20%
2010 0.00% 5.60%
2011 0.00% 48.80%
2012 0.00% 17.40%
2013 1.20% 12.90%
2014 5.20% 3.70%
2015 74.20% 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.