Is Québec or Trois-Rivières better for the northern lights?

Québec sits closer to the oval, at 56.0 degrees geomagnetic against 55.6. Darkness, cloud and your dates decide the rest; the tables on this page show both towns month by month.

Which has longer nights in December, Québec or Trois-Rivières?

Québec, with 14.2 hours of civil night on December 15 against 14.1 in Trois-Rivières.

What Kp do Québec and Trois-Rivières need?

By SWPC's rule of 66 degrees at Kp 0 and 2 degrees per step, Québec needs about Kp 5 and Trois-Rivières Kp 6 for the average oval edge to sit overhead.

When is it too light for aurora in Québec and Trois-Rivières?

Québec: never, every night has civil darkness. Trois-Rivières: never, every night has civil darkness.

Which is clearer, Québec or Trois-Rivières?

Trois-Rivières, with 65% mean cloud in the months with 4 hours or more of civil night against 66% in Québec (NASA POWER, 2001 to 2020).

Comparison

Québec vs Trois-Rivières for the northern lights

Answer

Québec sits 0.5 degrees higher on the IGRF-14 dipole, 56.0 against 55.6. By SWPC's oval-edge rule Québec needs about Kp 5 for the average edge to sit overhead and Trois-Rivières Kp 6. On the map Québec is also closer to the pole, by 0.5 degrees.

56.0° / 55.6°

dipole latitude

Side by side

Computed figures for both towns
Figure	Québec	Trois-Rivières
Dipole latitude	56.0°	55.6°
Kp for the oval edge overhead	Kp 5	Kp 6
Civil night, December 15	14.2 h	14.1 h
Dark-season days	365	365
Nights with no civil darkness	0	0
Dark-month cloud, NASA POWER	66%	65%
Solar midnight, December 15	23:40	23:45

Québec sits at 56.0 degrees geomagnetic. By SWPC's rule the average oval edge is overhead at Kp 5, and aurora is usually visible on the northern horizon at G1 (Kp 5) or less. Trois-Rivières sits at 55.6 degrees geomagnetic. By SWPC's rule the average oval edge is overhead at Kp 6, and aurora is usually visible on the northern horizon at G1 (Kp 5) or less.

Civil night month by month

On December 15 Québec has 14.2 hours of civil night and Trois-Rivières 14.1. Across the 15th of each month, Québec is darker in 1 months and Trois-Rivières in 3. The widest gap comes in May, when Trois-Rivières has 0.1 more hours.

Hours of civil night on the 15th of each month, 2026
Month	Québec	Trois-Rivières	Difference
January	13.8 h	13.8 h	+0.0 h
February	12.5 h	12.5 h	+0.0 h
March	11.0 h	11.0 h	+0.0 h
April	9.2 h	9.2 h	+0.0 h
May	7.6 h	7.7 h	-0.1 h
June	6.7 h	6.8 h	-0.1 h
July	7.2 h	7.2 h	+0.0 h
August	8.6 h	8.7 h	-0.1 h
September	10.4 h	10.4 h	+0.0 h
October	12.0 h	12.0 h	+0.0 h
November	13.4 h	13.4 h	+0.0 h
December	14.2 h	14.1 h	+0.1 h

Difference: Québec minus Trois-Rivières. Each figure links to that town's month page.

Season and midnight sun

Québec has some civil darkness every night of 2026, and clears Glow's 4-hour dark-season bar every evening. Trois-Rivières has some civil darkness every night of 2026, and clears Glow's 4-hour dark-season bar every evening.

Distance, cloud and time zones

The two towns are 114 km apart by great circle. In the dark months both average about 66% cloud in NASA POWER's 2001 to 2020 record. Québec's best month by civil night times clear sky is January. Trois-Rivières's best month by civil night times clear sky is January. Time zones: America/Toronto and America/Toronto.

For tonight, open the live pages for Québec and Trois-Rivières, which carry the live OVATION cell.

Questions

Is Québec or Trois-Rivières better for the northern lights?: Québec sits closer to the oval, at 56.0 degrees geomagnetic against 55.6. Darkness, cloud and your dates decide the rest; the tables on this page show both towns month by month.
Which has longer nights in December, Québec or Trois-Rivières?: Québec, with 14.2 hours of civil night on December 15 against 14.1 in Trois-Rivières.
What Kp do Québec and Trois-Rivières need?: By SWPC's rule of 66 degrees at Kp 0 and 2 degrees per step, Québec needs about Kp 5 and Trois-Rivières Kp 6 for the average oval edge to sit overhead.
When is it too light for aurora in Québec and Trois-Rivières?: Québec: never, every night has civil darkness. Trois-Rivières: never, every night has civil darkness.
Which is clearer, Québec or Trois-Rivières?: Trois-Rivières, with 65% mean cloud in the months with 4 hours or more of civil night against 66% in Québec (NASA POWER, 2001 to 2020).

Sources and verification

IGRF-14 coefficients, NOAA NCEIhttps://www.ngdc.noaa.gov/IAGA/vmod/coeffs/igrf14coeffs.txt
SunCalchttps://github.com/mourner/suncalc
GeoNameshttps://www.geonames.org/export/
NASA POWER climatologyhttps://power.larc.nasa.gov/docs/services/api/temporal/climatology/
NOAA SWPC, Tips on viewing the aurorahttps://www.spaceweather.gov/content/tips-viewing-aurora

Quoted figures last checked against their sources on 2026-09-30; next review 2026-12-31. Computed figures come from SunCalc and the IGRF-14 dipole as described in the methodology. Every quote is listed in the sources ledger.