I lived in Alaska for the vast majority of my life, moved out last year because my dad lost his job and his new one was outta state. So I grew up in the cold.
First off, it's a lot lighter at night than you'd think it would be, because of the snow. Every trace of light bounces off of the snow and gets magnified like tenfold, so it's really nice driving at night, except for the ice. However, in the day time, sunglasses are a must; otherwise you'll be squinting and blinded the whole time.
Second, if you go outside without the proper gear on, you will be freezing cold within minutes. Where I lived, the temps in winter time hovered around the teens. You could freeze to death if you weren't properly outfitted.
Third. If there are mountains, you can watch the snow creep down the mountains over the weeks, until suddenly the snow is right in your yard. After that, it doesn't leave until spring.
Fourth. The Northern lights are absolutely gorgeous, but they don't usually look like the photos you see online. Those are long exposures, usually, and sometimes are taken with special lenses. Your average Northern Lights look like green waves in the sky. Green is the most common. I've never seen any other color except for kind of a yellowy color.
Uhm…I don't know what exact info you wanted, but that's a bunch of random stuff lol