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Colder climate hurts range on electric vehicles.

On the plus side for EV adoption in colder climates, they've got outlets everywhere for people to plug in the block heaters on their cars, so they're totally ready in terms of public slow-charging infrastructure.

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Doesn't it hurt range, but increase battery longevity?

ISTR hot climates being more problematic for EV owners in terms of premature battery wear.

No, batteries do not like to be too hot, nor too cold. There is an operating range. This is why Teslas keep their packs cool in the heat, but will also restrict charge rate from regeneration or charging (yellow dotted line on energy consumption graph) until the pack has been brought up to operating temp.

Hot climates killed Nissan LEAF packs faster because of poor (air cooling) thermal management. Tesla packs use liquid cooling, and aggressively manage the battery pack to ensure longevity.

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