I know that it's very slim chance to none but since the northern auroral zone would be covered in midnight sun (the more northern than the longer the midnight sun is) perhaps there's area below the auroral zone with better chance of getting the aurora? I will be travelling to all 4 Scandinavian countries and actually i think the northermost of our trip would be around Sweden's Jukkasyarvi. How long would the sun set in Jukkasyarvi during summer time? is it still worth it to do aurora tour during mid to end of June? I'm not sure if there's still any aurora tour available during those period as well though.