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Ground temperature up to 30 feet deep varies as a function of depth and the seasonal temperature. The further down you go, the more it "averages" the location's seasonal variations and the more it lags the seasonal changes. Hole in the ground In southwest canada (vancouver, for instance) you can expect that four feet down the ground will be around 50F ...


If you only use PET bottle try to put a neoprene sleeve around them. Neoprene is used to insulate the tubes of the so called "hydration systems", that is those bladders with a tube going from the bladder to your mouth when you want to suck water from it. Neoprene works pretty well both in keeping the heat in winter and the opposite as you need. It doesn't ...

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