[NAFEX] Accurate well defined hardiness map.
Jwlehman at aol.com
Jwlehman at aol.com
Wed Dec 21 21:53:12 EST 2005
There is no such thing.
If you found one that divides down to the county level it will be
meaningless. Each zone has a 10 degree difference, and just because a line might be drawn
on a county line, those counties will not have average temps 10 degrees
warmer or colder than the other. Also those temp ranges aren't absolute. My zone
5b (-15 to -5, my extrapolation) regularly sees -20 and the record is -32.
Conclusion: A well defined map is meaningless. Close counts in horse shoes
(the game), hand grenades and USDA Hardiness Zones.
Opinion time: Add at least one zone to what most nursery catalogs list their
material to be hardy too. If they say zone 5, if might survive zone 6 over a
long time period.
Stephen is correct when he writes: Even in a very large area of a single
zone, one might live in a microclimate;
I might add, those microclimates can be much colder as well as warmer.
Jerry
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