Depends on the night, obviously, but "very cold" is a safe assertion. The first day there I had a hard time, thinking that my casual cold-weather gear would ke

Depends on the night, obviously, but "very cold" is a safe assertion. The first day there I had a hard time, thinking that my casual cold-weather gear would keep me comfortable was a mistake I learned the hard way tracking the northern lights on a mountaintop at 2 in the morning on the coldest night they'd had in 50 years. But, the next day I picked up a pair of (expensive) sweatpants to act as a third layer, and I was just fine. Toasty enough that at night times I'd casually take off a hat or some gloves. If you absolutely hate cold weather, maybe check it out in summer time. If you're willing to layer (and not just throw on dumb layers like I did) then it's totally manageable. I found the magic combo to be: * Thermalsilk top and bottom base layer * An intermediate layer for very cold nights (https://www.icewear.is/us/fodurland-wool-underwear-baselayer) * I got away with those two and a pair of Amazon Basics chinos, but a hard shell outer layer is probably smarter if you're trekking through snow Otherwise, normal layering rules apply. Have a scarf and gloves (ideally, with liners) and a good hat, then Thermalsilk and a winter coat were all I needed, but I would often have a niceish sweatshirt layered in there as we often had dinner plans and I didn't want to violate any dress-code norms.