@NathanG - Yeah, I always make it a point to let my water faucets drip during the cold winter months. Temperature does affect burst pressure, not just cold but heat as well.
One summer I left my garden hoses out in the summer heat; this particular summer it was a veritable drought, and we had weeks on end of triple digit temperatures.
I turned on the hose and it burst, not only in the nozzle but in the middle of the hose where apparently the heat had seared through a hole. I had to buy a new hose, and made it a point never to leave it outside again.