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I am sorry Sandy but the onlyI am sorry Sandy but the only place you might find natural temperatures like this would be in the Alaska permafrost. What you are dicsribing is a refrigerator not a root cellar. It is not possible. The internet is a wealth of bad information.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?