Home / Aurora borealis
Watching the aurora borealis from northern Canada.
The aurora borealis is the one sky phenomenon that draws people north in winter regardless of the cold. Canada's position is a large part of why: a wide band of the country, and especially the Northwest Territories, sits directly beneath the zone where the northern lights appear most reliably.
Why latitude — and the right latitude — matters
Auroras form when charged particles from the Sun are funnelled along Earth's magnetic field into a ring-shaped region around the magnetic pole called the auroral oval. When activity is low, the oval typically sits near 67 degrees corrected geomagnetic latitude; as activity rises, the band widens and pushes south.
This is why a city's geographic latitude is only part of the story. Yellowknife, at about 62.5°N geographic, lies under the centre of the auroral oval thanks to its geomagnetic position, which is why it is so consistently good for aurora viewing. On clear nights the lights appear there frequently, with the hours around local midnight often the most active.
Two seasons, not one
The Northwest Territories has two recognised viewing seasons: a fall season from roughly mid-August to late September, and a longer winter season from mid-November into early April. Both pair long, dark nights with the region's frequently clear interior skies.
What helps your odds
The aurora is never guaranteed on a given night, but a few factors stack the deck in your favour.
| Factor | Why it matters |
|---|---|
| Clear skies | Cloud is the single biggest obstacle; interior climates tend to be clearer than coastal ones. |
| Darkness | Get away from town lights and aim for nights without a bright Moon. |
| Time of night | Activity often peaks in the late evening to the small hours. |
| Multiple nights | Giving yourself several nights in a peak season greatly improves the chance of a clear, active sky. |
Reading a forecast
Aurora forecasts describe the level of geomagnetic activity and how far south the oval is likely to reach. A higher activity level means the band is wider and brighter, improving prospects even at the southern edge of the viewing zone. For the day-to-day picture in the NWT, the City of Yellowknife points visitors to dedicated local aurora forecasting; checking the forecast alongside a plain cloud-cover forecast is the most practical routine.
The aurora rewards patience and clear, dark skies more than anything else. Pick a peak season, give yourself several nights, get away from lights, and watch the northern sky.
Observing comfortably
- Dress for hours outdoors. Winter nights in the north regularly fall well below freezing; the cold, not the dark, ends most sessions early.
- Protect your night vision. Use red light, and keep phone screens dimmed.
- Find an open horizon. Flat, unobstructed sites give the fullest view as the oval shifts overhead.
- Be ready for quiet nights. Even under the oval, activity rises and falls; a calm sky one night can erupt the next.
For current conditions and local guidance, the City of Yellowknife aurora forecast page is a useful public starting point. While you wait for the lights, the winter sky guide covers the constellations overhead, and the Dark-Sky Preserves guide lists the darkest sites to view them from.