Is Fargo or Duluth better for the northern lights?

Duluth sits closer to the oval, at 55.4 degrees geomagnetic against 55.1. 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, Fargo or Duluth?

Fargo, with 14.2 hours of civil night on December 15 against 14.2 in Duluth.

What Kp do Fargo and Duluth need?

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

When is it too light for aurora in Fargo and Duluth?

Fargo: never, every night has civil darkness. Duluth: never, every night has civil darkness.

Which is clearer, Fargo or Duluth?

Fargo, with 59% mean cloud in the months with 4 hours or more of civil night against 61% in Duluth (NASA POWER, 2001 to 2020).

Comparison

Fargo vs Duluth for the northern lights

Answer

Duluth sits 0.2 degrees higher on the IGRF-14 dipole, 55.4 against 55.1. By SWPC's oval-edge rule Duluth needs about Kp 6 for the average edge to sit overhead and Fargo Kp 6. That reverses the map, where Fargo is 0.1 degrees closer to the pole.

55.1° / 55.4°

dipole latitude

Side by side

Computed figures for both towns
Figure	Fargo	Duluth
Dipole latitude	55.1°	55.4°
Kp for the oval edge overhead	Kp 6	Kp 6
Civil night, December 15	14.2 h	14.2 h
Dark-season days	365	365
Nights with no civil darkness	0	0
Dark-month cloud, NASA POWER	59%	61%
Solar midnight, December 15	00:22	00:04

Fargo sits at 55.1 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. Duluth sits at 55.4 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 Fargo has 14.2 hours of civil night and Duluth 14.2. Across the 15th of each month, Fargo is darker in 1 months and Duluth in 1. The widest gap comes in July, when Duluth has 0.1 more hours.

Hours of civil night on the 15th of each month, 2026
Month	Fargo	Duluth	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	7.6 h	+0.0 h
June	6.7 h	6.7 h	+0.0 h
July	7.1 h	7.2 h	-0.1 h
August	8.6 h	8.6 h	+0.0 h
September	10.4 h	10.4 h	+0.0 h
October	12.0 h	12.0 h	+0.0 h
November	13.5 h	13.4 h	+0.1 h
December	14.2 h	14.2 h	+0.0 h

Difference: Fargo minus Duluth. Each figure links to that town's month page.

Season and midnight sun

Fargo has some civil darkness every night of 2026, and clears Glow's 4-hour dark-season bar every evening. Duluth 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 356 km apart by great circle. In the dark months Fargo averages 59% cloud and Duluth 61%, from NASA POWER's 2001 to 2020 record. Fargo's best month by civil night times clear sky is January. Duluth's best month by civil night times clear sky is February. Time zones: America/Chicago and America/Chicago.

For tonight, open the live pages for Fargo and Duluth, which carry the live OVATION cell.

Questions

Is Fargo or Duluth better for the northern lights?: Duluth sits closer to the oval, at 55.4 degrees geomagnetic against 55.1. 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, Fargo or Duluth?: Fargo, with 14.2 hours of civil night on December 15 against 14.2 in Duluth.
What Kp do Fargo and Duluth need?: By SWPC's rule of 66 degrees at Kp 0 and 2 degrees per step, Fargo needs about Kp 6 and Duluth Kp 6 for the average oval edge to sit overhead.
When is it too light for aurora in Fargo and Duluth?: Fargo: never, every night has civil darkness. Duluth: never, every night has civil darkness.
Which is clearer, Fargo or Duluth?: Fargo, with 59% mean cloud in the months with 4 hours or more of civil night against 61% in Duluth (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.