In January 2012 we spent a week in Lapland. It was a magical time and experience, but it was not a picnic. When the temperature outside was about -25°C you could not wear too many clothes. The wind up on the mountains made it feel even colder.
In midwinter the light is just something that you can not see anywhere else, it is so blue that you can hardly believe it especially when you download your images on the computer. The sun is up only for a few hours; from about 11 til 14 PM.
If the night is clear and you are lucky, you can see the Northern lights. This time we did not see them, but it didn't really matter because we saw so much beauty.