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American Horticultural Society Heat Zone Map
"The 12 zones of the map indicate the average number of days each year that a given region experiences 'heat days'--temperatures over 86 degrees (30 degrees Celsius)." The site has a Zip Code Zone Finder (1997 data) so users can determine their garden's heat zone and choose plants accordingly. The heat zones complement the well-known system of USDA Hardiness Zones, which measure winter cold in a similar fashion.
http://www.ahs.org/publications/heat_zone_map.htm
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