Is Fairbanks or Eagle River better for the northern lights?

Fairbanks sits closer to the oval, at 65.7 degrees geomagnetic against 62.1. 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, Fairbanks or Eagle River?

Fairbanks, with 17.2 hours of civil night on December 15 against 16.3 in Eagle River.

What Kp do Fairbanks and Eagle River need?

By SWPC's rule of 66 degrees at Kp 0 and 2 degrees per step, Fairbanks needs about Kp 1 and Eagle River Kp 2 for the average oval edge to sit overhead.

When is it too light for aurora in Fairbanks and Eagle River?

Fairbanks: May 13 to July 28. Eagle River: June 1 to July 9.

Which is clearer, Fairbanks or Eagle River?

Fairbanks, with 64% mean cloud in the months with 4 hours or more of civil night against 72% in Eagle River (NASA POWER, 2001 to 2020).

Comparison

Fairbanks vs Eagle River for the northern lights

Answer

Fairbanks sits 3.6 degrees higher on the IGRF-14 dipole, 65.7 against 62.1. By SWPC's oval-edge rule Fairbanks needs about Kp 1 for the average edge to sit overhead and Eagle River Kp 2. On the map Fairbanks is also closer to the pole, by 3.5 degrees.

65.7° / 62.1°

dipole latitude

Side by side

Computed figures for both towns
Figure	Fairbanks	Eagle River
Dipole latitude	65.7°	62.1°
Kp for the oval edge overhead	Kp 1	Kp 2
Civil night, December 15	17.2 h	16.3 h
Dark-season days	266	288
Nights with no civil darkness	77	39
Dark-month cloud, NASA POWER	64%	72%
Solar midnight, December 15	00:46	00:54

Fairbanks sits at 65.7 degrees geomagnetic, inside SWPC's 60 to 75 degree band, where aurora can be seen on more than half of all nights. No storm is needed: by SWPC's rule the average oval edge is overhead at Kp 1. Eagle River sits at 62.1 degrees geomagnetic, inside SWPC's 60 to 75 degree band, where aurora can be seen on more than half of all nights. No storm is needed: by SWPC's rule the average oval edge is overhead at Kp 2.

Civil night month by month

On December 15 Fairbanks has 17.2 hours of civil night and Eagle River 16.3. Across the 15th of each month, Fairbanks is darker in 5 months and Eagle River in 6. The widest gap comes in May, when Eagle River has 3.7 more hours.

Hours of civil night on the 15th of each month, 2026
Month	Fairbanks	Eagle River	Difference
January	16.3 h	15.5 h	+0.8 h
February	13.5 h	13.2 h	+0.3 h
March	10.4 h	10.6 h	-0.2 h
April	6.6 h	7.4 h	-0.8 h
May	0.0 h	3.7 h	-3.7 h
June	0.0 h	0.0 h	+0.0 h
July	0.0 h	2.0 h	-2.0 h
August	5.0 h	6.2 h	-1.2 h
September	9.2 h	9.5 h	-0.3 h
October	12.5 h	12.4 h	+0.1 h
November	15.5 h	14.9 h	+0.6 h
December	17.2 h	16.3 h	+0.9 h

Difference: Fairbanks minus Eagle River. Each figure links to that town's month page.

Season and midnight sun

Fairbanks has no civil darkness from May 13 to July 28, 77 nights in 2026, and its dark season, 4 or more evening hours of civil night, lasts 266 days. Eagle River has no civil darkness from June 1 to July 9, 39 nights in 2026, and its dark season, 4 or more evening hours of civil night, lasts 288 days.

Distance, cloud and time zones

The two towns are 402 km apart by great circle. In the dark months Fairbanks averages 64% cloud and Eagle River 72%, from NASA POWER's 2001 to 2020 record. Fairbanks's best month by civil night times clear sky is January. Eagle River's best month by civil night times clear sky is January. Time zones: America/Anchorage and America/Anchorage.

For tonight, open the live pages for Fairbanks and Eagle River, which carry the live OVATION cell.

Questions

Is Fairbanks or Eagle River better for the northern lights?: Fairbanks sits closer to the oval, at 65.7 degrees geomagnetic against 62.1. 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, Fairbanks or Eagle River?: Fairbanks, with 17.2 hours of civil night on December 15 against 16.3 in Eagle River.
What Kp do Fairbanks and Eagle River need?: By SWPC's rule of 66 degrees at Kp 0 and 2 degrees per step, Fairbanks needs about Kp 1 and Eagle River Kp 2 for the average oval edge to sit overhead.
When is it too light for aurora in Fairbanks and Eagle River?: Fairbanks: May 13 to July 28. Eagle River: June 1 to July 9.
Which is clearer, Fairbanks or Eagle River?: Fairbanks, with 64% mean cloud in the months with 4 hours or more of civil night against 72% in Eagle River (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.