You never know on the winters in the region, some years you will have lows down to the upper teens other years it will barely drop into the 20's for a couple of hours during the night. It is rare to have temperatures stay below freezing for over 24 hours, though it does happen, maybe once per year or less on average. The more common winter weather has a mix of cold an dreary weather with lows in the 30's on the other end the occasional day in the 70's or even low 80's may occur any moth of the year. I would estimate on average December - February you should expect to need to protect you water hose from freezing about one night every 2-2 weeks.