Climate Zones.
Roy M. Sachs (Thu, 27 Oct 2005 11:30:46 PDT)

John: ZIP codes won't get it all done re climate, though that kind
of max/min, heat unti stuff would be of help to people in other time
zones.

I've seen citrus and rice "boundary" lines drawn for Yolo County (in
CA where Davis is located) that go right through some ZIP codes; I
know that apricot and some other fruit trees have narrow zones for
optimum performance (although I haven't seen the boundary lines I'm
sure they cut out parts of some rural ZIP codes).

And the lines defining soil type, which for some of the things I grow
would be as important as microclimate, run right through neighboring
farms. I have.pure potter's clay over 20 acres,.but a neighbor across
the road has some porous mix deposited by eons of slough overflow as
well as pure clay.

Roy