Susan, I found these instructions on the Colorado State Extension Service Web site, which is always a good resource for high-altitude cooking and baking:
"If you use a candy thermometer, first test the temperature at which your water boils, then reduce the finish temperature by the difference between the temperature of your boiling water and 212 degrees. This is an approximate decrease of 2 degrees for every increase of 1,000 feet in elevation."
Good luck - PJH
September 28, 2014 at 10:33pm
In reply to I love boiled cider and always add it to apple pies, and agree … by Susan (not verified)