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Re: Yes, I'll take your rain

  • Subject: Re: Yes, I'll take your rain
  • From: "David Ferguson" <manzano57@msn.com>
  • Date: Thu, 15 Mar 2007 23:44:51 -0600
  • Seal-send-time: Thu, 15 Mar 2007 23:44:51 -0600

Hi Linda,
I don't remember where you live, but I might know which zone you are in if you refresh my memory.
The Zones are based on the average of the yearly minimum temperatures.  In other words, they take the single coldest temperature for every year and average them.  It can get much lower than the temperature listed for a zone almost anywhere inland, but generally plants that are "hardy" in a given zone can handle lower temperatures at least briefly.  It should also be remembered that just because a plant is rated to (for example) -30F, it doesn't mean that it will be hardy in the zone that is based on the -30 to -40 degree range (remember that is the average of the lows and probably much higher than the real possible minimum).  It will probably be reliably hardy in one or two zones warmer.
As for Heat Zone maps, yes there is an equivalent map for heat zones, and I believe it is figured differently (if I remember correctly it is number of days reaching above 85 F).  I don't know a link to find it off-hand, but it is readily available on line, and is in many newer garden books and sales catalogs.  Just do a Google search for "Heat-Zones" or "Heat-Zone map" and you should get lots of hits.
----- Original Message -----
Sent: Wednesday, March 14, 2007 7:28 AM
Subject: [iris-photos] Yes, I'll take your rain
Date: 03/09/07 08:39:12
Subject: Yes, I'll take your rain
 I keep wondering when they will extend the intercoastal waterway to our part of the world or even a bit of the MS river would be wonderful. Just think of all that wonderful silt.
Speaking of weather.  Still trying to figure out what zone I'm in.
Using this chart does it mean once in 50 years it might get 0 or is it the mean avg. or what??
  • And I'm not sure for my little town, how to find records specific for it.  It's rare that it would get 10F or even 15F but it does happen. So if it has happen does that mean I use that zone.
  • What about wind chill factor??
USDA Zone 6a: to -23.3° C (-10° F)
USDA Zone 6b: to -20.5° C (-5° F)
USDA Zone 7a: to -17.7° C (0° F)
USDA Zone 7b: to -14.9° C (5° F)
USDA Zone 8a: to -12.2° C (10° F)
USDA Zone 8b: to -9.4° C (15° F)

I've been considering myself a zone 7, but looking at this chart again, I may be more like a zone 8.

And wondering if there is a chart for other side of coin. Like how hot it gets?? Or do iris not care how hot they get??


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