Norway has huge financial incentives for buying EVs, including exemption from VAT and registration fees. This has added up to billions of USD in subsidies, [1] and is why there are so many EVs in Norway. I'd be very surprised if their neighbors, who have similar climate but fewer incentives, see the same rate of adoption.

Norway shows that you can have EVs in a place that is very cold if you shovel cash at buyers. It doesn't prove that weather wouldn't be a central factor in a place like Maine.

1: https://www.oecd.org/climate-action/ipac/practices/norway-s-...