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 Percent
1910 8.30%
1911 3.90%
1912 6.90%
1913 0.00%
1914 11.90%
1915 15.60%
1916 16.70%
1917 7.50%
1918 8.70%
1919 11.30%
1920 3.40%
1921 11.80%
1922 12.00%
1923 16.00%
1924 4.70%
1925 11.40%
1926 12.90%
1927 1.70%
1928 1.50%
1929 4.70%
1930 17.50%
1931 10.90%
1932 12.40%
1933 12.30%
1934 7.80%
1935 4.90%
1936 6.30%
1937 12.60%
1938 4.60%
1939 6.40%
1940 8.30%
1941 9.70%
1942 7.60%
1943 6.40%
1944 23.20%
1945 1.50%
1946 4.60%
1947 14.70%
1948 8.10%
1949 3.10%
1950 7.90%
1951 6.40%
1952 7.90%
1953 17.30%
1954 0.00%
1955 0.00%
1956 14.00%
1957 4.70%
1958 11.00%
1959 8.00%
1960 8.10%
1961 1.60%
1962 6.30%
1963 7.90%
1964 14.50%
1965 6.10%
1966 7.60%
1967 12.50%
1968 6.30%
1969 18.60%
1970 24.20%
1971 6.30%
1972 4.90%
1973 7.90%
1974 6.10%
1975 6.50%
1976 6.30%
1977 4.90%
1978 7.80%
1979 9.90%
1980 0.00%
1981 7.90%
1982 11.00%
1983 5.10%
1984 3.40%
1985 8.10%
1986 6.40%
1987 12.40%
1988 9.80%
1989 12.80%
1990 4.60%
1991 11.10%
1992 8.00%
1993 15.80%
1994 14.30%
1995 7.50%
1996 9.40%
1997 3.20%
1998 6.50%
1999 14.20%
2000 8.20%
2001 18.90%
2002 9.40%
2003 3.60%
2004 4.70%
2005 20.50%
2006 11.60%
2007 27.30%
2008 18.20%
2009 8.70%
2010 10.60%
2011 8.50%
2012 7.70%
2013 12.70%
2014 19.80%
2015 13.60%

*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.