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 3.90%
1911 8.10%
1912 12.00%
1913 6.10%
1914 13.60%
1915 9.30%
1916 4.50%
1917 10.20%
1918 12.40%
1919 3.50%
1920 4.50%
1921 11.60%
1922 4.90%
1923 10.80%
1924 4.50%
1925 10.70%
1926 3.40%
1927 4.50%
1928 9.90%
1929 4.40%
1930 10.00%
1931 14.20%
1932 11.10%
1933 14.70%
1934 4.70%
1935 4.40%
1936 23.70%
1937 4.50%
1938 10.00%
1939 5.40%
1940 6.50%
1941 12.70%
1942 6.60%
1943 7.80%
1944 4.50%
1945 12.80%
1946 14.50%
1947 11.70%
1948 5.60%
1949 3.30%
1950 13.20%
1951 7.50%
1952 4.40%
1953 11.00%
1954 6.60%
1955 3.20%
1956 3.30%
1957 6.60%
1958 6.80%
1959 3.20%
1960 12.30%
1961 7.70%
1962 0.00%
1963 6.70%
1964 4.60%
1965 6.50%
1966 9.50%
1967 5.50%
1968 3.30%
1969 2.20%
1970 6.40%
1971 7.40%
1972 4.20%
1973 3.30%
1974 12.60%
1975 10.50%
1976 6.40%
1977 5.30%
1978 12.90%
1979 8.90%
1980 16.60%
1981 13.00%
1982 5.90%
1983 6.70%
1984 4.30%
1985 17.50%
1986 7.70%
1987 6.70%
1988 6.70%
1989 13.20%
1990 10.00%
1991 10.90%
1992 5.80%
1993 14.10%
1994 6.70%
1995 14.60%
1996 7.60%
1997 11.70%
1998 10.90%
1999 18.60%
2000 11.50%
2001 17.80%
2002 12.60%
2003 8.90%
2004 3.40%
2005 10.50%
2006 5.60%
2007 18.50%
2008 6.80%
2009 5.50%
2010 17.60%
2011 10.70%
2012 11.60%
2013 12.20%
2014 8.70%
2015 15.90%

*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.