As part of ongoing research, a new website that has information on
recent air-temperature trends over North America (U.S.A. and Canada) has
been developed:
http://mypage.iu.edu/~srobeson/grd/
Specifically, the site has information on trends in time-varying
percentiles (from the 5th to the 95th, in 5-percentile intervals) of
both daily minimum and maximum air temperature for the period 1948-2000.
Both summary graphics and data tables are available for nearly 400
grid points. This work is discussed in more depth here:
Robeson, S. M. (2004) "Trends in time-varying percentiles of daily
minimum and maximum temperature over North America," Geophysical
Research Letters, 31, L04203, doi:10.1029/2003GL019019.
http://www.agu.org/pubs/crossref/2004/2003GL019019.shtml
Please feel free to contact me with questions or comments on the site.
Scott Robeson
Department of Geography
Indiana University
Bloomington, Indiana (USA)
srobeson@indiana.edu