Good question. We've had our Clarity for 2 months. When we first bought it we had to drive freeway miles at high speeds and it charged to 43. Then, after my wife drove it just to and from work in town on electric for a week or so, it gradually increased almost daily until it got to 52. Now that night temps have cooled to the 30 degree range it's gone back down to 42. I'm curious what it will charge to when it gets below zero. Knowing that it will have a reduced charge in the winter is one of the reasons I went with the Clarity rather than the Prius Prime -- I was concerned the Prime -- rated at a 24 mile charge -- would barely have 15 in the middle of winter.