Not sure what a 5M sports hall is or why you would need a shared bike locker that fits 20 bikes, but cycling is great in Northern New England once you get acclimated to the cold and the hills. Nice thing about the hills is that they moderate the wind to some degree. Here in Vermont it rarely gets above 90 degrees F. In fact, summer mornings can be chilly. Layers are good.

If you move now, you'll be able to adjust gradually to the cool, then cold fall and winter weather. I find that I can do my one hour commute comfortably down to 20 degrees F. I wear heavy, Smart Wool sox, tights, mtg shorts and three layers above in the coldest weather: a fleecy long sleeve shirt, a zippered wind vest and a high visibility wind breaker. Earflap hat under my helmet and, because I ride single speed and don't need to shift, heavy mittens on my hands with sometimes thin gloves underneath. Can't do a balaclava because it steams up my glasses.

One big consideration up here is that they salt the highways heavily and it can bind up your derailleur in one ride if the road gets slushy. Sunny warm days end up being the worst to ride on sometimes because the melting snowbanks create streams of salt water across the roads. Single speeds can be an advantage in this situation as they are easier to clean up, but you'll still have to watch out for wheel and pedal bearings rusting up. Make sure to keep your chain oiled.

On the plus side, drivers are more aware of cyclists, at least in Vermont and New Hampshire, than in many other states and there is a lot less glass on the road than in other places I've ridden. The scenery is lovely and all of those hard climbs will afford you wonderful views and speedy descents. I think you'll like it here.