Disclaimer: I don't live in that kind of climate and my knowledge here comes from talking to people in Minnesota and reading some reddit posts I think temps ab

Disclaimer: I don't live in that kind of climate and my knowledge here comes from talking to people in Minnesota and reading some reddit posts I think temps above 0°F aren't that big of a deal. The cold will hurt you more in terms of miles per kWh than it will for charging speeds. If you go below 0 that's when the car might spend the majority of incoming juice maintaining battery temps if it's sitting outside on an L1 charger. However even that will vary from car to car.