U.S. Climate Extremes Index (CEI): Graph

NCEI replaced input data for the CEI mean monthly maximum and minimum temperature extremes on Thursday, October 6, 2016, coincident with the release of the September 2016 monthly monitoring report. For more information on transition from USHCN to nClimGrid data, please visit the CEI - Data Used page.

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 22.58%
1911 25.20%
1912 35.10%
1913 18.32%
1914 18.28%
1915 20.68%
1916 27.68%
1917 34.20%
1918 10.48%
1919 19.54%
1920 18.10%
1921 25.42%
1922 17.98%
1923 18.60%
1924 30.54%
1925 12.16%
1926 17.64%
1927 20.08%
1928 11.42%
1929 25.88%
1930 14.46%
1931 25.68%
1932 13.10%
1933 22.84%
1934 37.86%
1935 11.30%
1936 17.94%
1937 13.12%
1938 16.34%
1939 19.32%
1940 22.42%
1941 29.10%
1942 12.32%
1943 10.42%
1944 12.32%
1945 12.04%
1946 11.52%
1947 8.84%
1948 15.50%
1949 15.02%
1950 23.62%
1951 24.60%
1952 12.86%
1953 21.96%
1954 28.86%
1955 19.22%
1956 18.02%
1957 15.42%
1958 20.82%
1959 12.46%
1960 13.14%
1961 13.40%
1962 7.80%
1963 17.24%
1964 17.74%
1965 14.78%
1966 16.12%
1967 7.72%
1968 15.88%
1969 11.30%
1970 8.24%
1971 10.30%
1972 14.66%
1973 18.46%
1974 10.50%
1975 17.98%
1976 23.10%
1977 9.40%
1978 19.36%
1979 24.44%
1980 10.48%
1981 19.74%
1982 19.12%
1983 26.40%
1984 15.18%
1985 17.42%
1986 15.88%
1987 20.44%
1988 16.64%
1989 18.38%
1990 22.44%
1991 18.00%
1992 18.02%
1993 21.98%
1994 11.64%
1995 16.72%
1996 30.30%
1997 14.58%
1998 40.04%
1999 24.90%
2000 15.34%
2001 19.52%
2002 18.16%
2003 24.24%
2004 17.38%
2005 19.00%
2006 31.50%
2007 29.08%
2008 17.42%
2009 14.78%
2010 22.94%
2011 26.92%
2012 50.72%
2013 18.68%
2014 27.08%
2015 41.96%
2016 44.04%
2017 38.32%

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.