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Old 09-04-2005, 01:26 PM
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Critical Care Critical Care is offline
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Join Date: Nov 2003
Location: Central Oregon
Posts: 1,654
I was just glancing at my Sunset book and it has a chapter in it stating how the USDA climatic zones are based, which is upon winter minimum temperatures. Sunset uses this information, the information that Timturf mentioned (the American Horticultural Society heat zone system), elevation, humidity, rainfall, and other factors to come up with their rating. Over the years Sunset has gotten more detailed, especially in some areas, breaking down zones into subzones, etc. Hopefully they keep at it because I'd like to see some of the colder zones, such as mine, detailed a bit more.
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