We had 52 F yesterday and 38 F low, but 3 days below 0 F just before Xmas...We get cold snaps, but they usually don't last long enough to freeze up the meter or water line buried a foot down in the yard. Mid-January and our high today is 56F and low 39F. Per the iPhone weather app, on Saturday a week from now our low will be 28F with a high of 53F. Our footers tend to only need to go 12" down as well.
28 F is cold enough to freeze and break the water meter unless you keep a little water flow moving through it...