[NAFEX] climate zone maps
6ducks at fuse.net
Mon Dec 19 12:49:20 EST 2005
The USDA climate zones (the ones you see referenced in plant catalogs, i.e.
'grows in zones 5-8') are based on the average winter low temperatures as
observed over many years.
The American Horticultural Society has devised a heat zone map based on the
number of days (in an average year) where daytime highs are 86 F. or
They can be accessed here:
My favorite maps for horticulture students are the Sunset climate zones,
which take into account a variety of factors besides hot and cold, such as
growing season length, ocean influence or lack thereof, wind patterns,
aridity or humidity of the climate in general, etc. Sunset maps can be
accessed here along with a discussion of pros and cons of using zone maps:
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