I charge my MS 70D (rated range 386km) with a 120V/15A outlet at home in an unheated/uninsulated detached garage here in Vancouver. I get a pretty consistent +6km/hr rated range charging at home, year-round even in winter. Looking back in my logs I don't think I've ever seen a charge rate of less than about +5.5km rated range on even the coldest nights.
I usually have overnight charge scheduled in the middle of the night (i.e. often a cold battery). The winter weather here is mild enough that it isn't a factor on home charge-rate, based on my past 3 winters' experience. Of course it will depend on your own daily mileage requirement, and yes during winter conditions you WILL consume more energy driving than usual. But 120V charging is enough for my low daily mileage - on average I drive about 40km/day, and usually only have my overnight charge set to about 65-70% but never have to worry about range for local in-town driving.