As long as you do not experience such a season, you pack some excessive warm clothes, or hire it when you arrive there, a word of caution, if you decide to go with a rental option, always have the opportunity to get caught in the destination with the northern lights tours.
With proper research, holidays in Northern lighting can be very easy, make sure you are searching for the best deals. In the end, you should consider planning for a trip to Tromso in January for the Northern Lights Festival. This can be the best thing you can do. Iceland is one of the most appealing countries where watching the north lights.