I was thinking the exact same thing…
The weather at either Bowdoin or Amherst College would be a “jurassic” change from Hawaii. However, I do not think that the weather is going to vary much between Brunswick as compared to Amherst. Bowdoin is indeed a bit further north. However it is also a lot closer to the coast. Being close to the coast probably impacts the weather more than being further north. As such in terms of being bitterly cold on a winter evening, I do not think that they are going to vary much. Either location will get lots of snow. I would need to do a Google search to figure out which is colder or gets more snow (and this is after living somewhere between the two for decades and visiting both many times). Summers, if you get to stay on campus in the summer, might be a bit milder in Brunswick, but either will be quite nice in the summer.
I would expect there to be opportunities to skate at either school. If you have never skated, expect to fall down a lot. Amherst College would be closer to downhill ski areas, although I am not a huge fan of learning to ski after reaching double digits in age (my kids and I all learned to ski when we were young). I used to teach first graders how to ski, and when they fell down I would occasionally try to guess (to myself entirely in my head only) which part of me would have broken if I had fallen the same way. We get less elastic as we get older.
I am guessing the same thing that @ucbalumnus guessed that you may be trying to decide which to ED to. I am doubting that you have already gotten acceptances to both. If you do get into both, I can see how this would be a tough decision.
If you are planning to apply ED, make sure that both would be affordable for you. I will admit that the results were not encouraging for us years ago when I ran the NPC’s for both schools, but your results may vary.
To me this would be a significant positive.