Aurora towns in Canada

Of the 130 indexed towns in Canada, 8 sit at 60 degrees geomagnetic or more, in or poleward of SWPC's 60 to 75 degree band, where no storm is needed; 71 sit between 55 and 60 degrees, where G1 (Kp 5) or less usually brings aurora into view; 51 sit below 55 degrees and need a G2 or stronger storm by NOAA's typical latitudes.

On December 15 the median town gets 14.2 hours of civil night. Yellowknife has the most at 16.6 hours and Burlington the least at 13.8. 2 of these towns lose civil darkness altogether around the June solstice; Yellowknife goes longest, 53 nights.

NASA POWER's 2001 to 2020 climatology puts median cloud amount in the dark months at 67%. Brandon is clearest at 59% and Terrace cloudiest at 79%. These are all-hours averages for 1 degree cells, not forecasts.

Multiplying civil night by the clear share of the sky, September comes out best for 75 of the 130 towns and January for 30. SWPC notes a tendency toward larger storms near the equinoxes, which this score does not include.

The towns fall in 12 first-level regions. Ontario has 52, Quebec has 51, British Columbia has 28, Alberta has 19. Regions with at least 5 indexed towns have their own page with three rankings.

• Ontario52 towns
• Quebec51 towns
• British Columbia28 towns
• Alberta19 towns
• New Brunswick8 towns
• Saskatchewan7 towns
• Newfoundland and Labrador5 towns
• Nova Scotia5 towns
• Manitoba3 towns
• Northwest Territories1 towns
• Prince Edward Island1 towns
• Yukon1 towns