Jim McKenney
Tue, 12 Jul 2005 12:51:36 PDT
Minus seventeen degrees C corresponds approximately to 0 degrees F; that
would put you in USDA zone 7, generally cited as minimum temperature 0
degrees F to +10 degrees F. 

If your winter temperatures regularly drop to minus seventeen degrees, it
makes better sense to consider your site a zone 6 site. 

Jim McKenney
Montgomery County, Maryland, USA, USDA zone 7, where temperatures as low as
0 F or minus seventeen C are fortunately experienced only once in many

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