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 25.40%
1911 15.80%
1912 17.10%
1913 11.30%
1914 10.40%
1915 0.00%
1916 5.40%
1917 0.00%
1918 10.50%
1919 5.50%
1920 5.40%
1921 5.40%
1922 16.00%
1923 10.90%
1924 0.00%
1925 10.50%
1926 16.40%
1927 15.40%
1928 0.00%
1929 0.00%
1930 0.00%
1931 26.40%
1932 0.00%
1933 15.00%
1934 14.70%
1935 10.10%
1936 19.80%
1937 10.10%
1938 5.00%
1939 0.00%
1940 5.00%
1941 5.70%
1942 0.00%
1943 0.00%
1944 0.00%
1945 10.00%
1946 5.00%
1947 9.90%
1948 0.00%
1949 5.20%
1950 14.80%
1951 21.00%
1952 0.00%
1953 0.00%
1954 0.00%
1955 0.00%
1956 14.50%
1957 5.50%
1958 10.70%
1959 4.90%
1960 10.10%
1961 4.80%
1962 0.00%
1963 0.00%
1964 0.00%
1965 5.30%
1966 5.00%
1967 20.00%
1968 5.20%
1969 15.10%
1970 4.90%
1971 4.80%
1972 15.10%
1973 0.00%
1974 10.20%
1975 4.80%
1976 5.00%
1977 25.00%
1978 0.00%
1979 5.30%
1980 5.10%
1981 0.00%
1982 5.00%
1983 9.70%
1984 15.00%
1985 22.40%
1986 4.90%
1987 16.30%
1988 10.10%
1989 4.90%
1990 0.00%
1991 14.70%
1992 25.90%
1993 10.80%
1994 0.00%
1995 5.20%
1996 5.50%
1997 5.10%
1998 5.50%
1999 0.00%
2000 5.10%
2001 5.10%
2002 10.80%
2003 5.50%
2004 15.20%
2005 0.00%
2006 0.00%
2007 0.00%
2008 0.00%
2009 0.00%
2010 11.10%
2011 6.30%
2012 0.00%
2013 11.80%
2014 5.70%
2015 12.00%

*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.