Tromsø vs Kiruna for the northern lights
Kiruna wins on the numbers: a viewing window on 30% of season nights against 24% for Tromsø, peaking in March at 46%.
| Tromsø | Kiruna | |
|---|---|---|
| Country | Norway | Sweden |
| Solar activity needed (Kp threshold — lower is better) | 1 | 2 |
| Season length (months with dark skies) | 9 | 9 |
| Best month | October (33%) | March (46%) |
| Season-average viewing nights | 24% | 30% |
| Clear-night share across the season | 25% | 38% |
Month by month
Two different trips
Tromsø — The aurora capital of the Arctic
Tromsø sits directly under the auroral oval, 350 km north of the Arctic Circle. Even on geomagnetically quiet nights the lights often appear overhead — the real question here is almost always the clouds, not the sun.
Kiruna — Sweden’s space town beneath the oval
Kiruna — home to the Esrange space centre and the Icehotel in nearby Jukkasjärvi — pairs easy flight access with reliably dark Lapland skies. It needs only modest activity (Kp 2) for overhead displays.