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% 61.60%
1911 0.00% 16.20%
1912 2.40% 9.60%
1913 7.00% 7.10%
1914 0.00% 15.60%
1915 2.40% 18.20%
1916 10.00% 0.00%
1917 0.00% 25.20%
1918 0.00% 4.40%
1919 0.00% 2.30%
1920 2.50% 18.70%
1921 2.40% 4.80%
1922 2.20% 6.50%
1923 0.00% 26.20%
1924 2.40% 5.00%
1925 0.00% 48.80%
1926 0.00% 45.30%
1927 31.20% 0.00%
1928 0.00% 39.70%
1929 0.00% 9.20%
1930 0.00% 12.50%
1931 0.00% 30.20%
1932 0.00% 13.20%
1933 4.60% 11.30%
1934 0.00% 64.10%
1935 2.30% 4.60%
1936 6.50% 16.40%
1937 11.30% 6.60%
1938 24.70% 2.30%
1939 0.00% 40.60%
1940 4.50% 0.00%
1941 11.30% 4.80%
1942 10.20% 2.70%
1943 0.00% 5.10%
1944 34.50% 0.00%
1945 2.40% 7.00%
1946 5.10% 12.10%
1947 22.30% 0.00%
1948 0.00% 8.70%
1949 0.00% 22.50%
1950 11.10% 4.70%
1951 34.30% 0.00%
1952 0.00% 8.70%
1953 13.00% 2.30%
1954 2.10% 2.20%
1955 0.00% 13.30%
1956 10.80% 4.50%
1957 4.70% 4.50%
1958 0.00% 51.50%
1959 0.00% 6.70%
1960 15.80% 2.20%
1961 0.00% 2.10%
1962 6.40% 8.80%
1963 4.40% 6.90%
1964 0.00% 2.20%
1965 50.70% 0.00%
1966 4.30% 6.80%
1967 0.00% 15.80%
1968 6.50% 2.20%
1969 0.00% 8.40%
1970 10.60% 2.20%
1971 2.10% 17.60%
1972 4.30% 0.00%
1973 33.90% 0.00%
1974 18.40% 0.00%
1975 2.20% 0.00%
1976 4.50% 4.30%
1977 10.90% 0.00%
1978 0.00% 4.20%
1979 23.70% 0.00%
1980 0.00% 31.30%
1981 2.10% 13.40%
1982 28.90% 0.00%
1983 22.50% 0.00%
1984 20.70% 8.40%
1985 9.00% 0.00%
1986 8.90% 2.30%
1987 0.00% 6.70%
1988 0.00% 37.40%
1989 2.10% 13.20%
1990 13.60% 2.10%
1991 28.60% 0.00%
1992 2.40% 4.60%
1993 17.90% 2.00%
1994 0.00% 29.80%
1995 22.30% 0.00%
1996 0.00% 6.70%
1997 6.70% 4.60%
1998 16.40% 2.30%
1999 9.10% 0.00%
2000 9.10% 0.00%
2001 30.40% 0.00%
2002 24.40% 0.00%
2003 6.80% 0.00%
2004 43.30% 0.00%
2005 6.30% 2.30%
2006 13.10% 0.00%
2007 11.20% 0.00%
2008 2.30% 0.00%
2009 2.10% 0.00%
2010 2.40% 4.50%
2011 40.40% 0.00%
2012 24.20% 0.00%
2013 49.10% 0.00%
2014 4.60% 0.00%
2015 2.70% 2.80%

*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.