Is Anchorage or Eagle River better for the northern lights?

Eagle River sits closer to the oval, at 62.1 degrees geomagnetic against 61.9. 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, Anchorage or Eagle River?

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

What Kp do Anchorage and Eagle River need?

By SWPC's rule of 66 degrees at Kp 0 and 2 degrees per step, Anchorage needs about Kp 3 and Eagle River Kp 2 for the average oval edge to sit overhead.

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

Anchorage: June 2 to July 8. Eagle River: June 1 to July 9.

Which is clearer, Anchorage or Eagle River?

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

Comparison

Anchorage vs Eagle River for the northern lights

Answer

Eagle River sits 0.2 degrees higher on the IGRF-14 dipole, 62.1 against 61.9. By SWPC's oval-edge rule Eagle River needs about Kp 2 for the average edge to sit overhead and Anchorage Kp 3. On the map Eagle River is also closer to the pole, by 0.1 degrees.

61.9° / 62.1°

dipole latitude

Side by side

Computed figures for both towns
Figure	Anchorage	Eagle River
Dipole latitude	61.9°	62.1°
Kp for the oval edge overhead	Kp 3	Kp 2
Civil night, December 15	16.3 h	16.3 h
Dark-season days	290	288
Nights with no civil darkness	37	39
Dark-month cloud, NASA POWER	72%	72%
Solar midnight, December 15	00:55	00:54

Anchorage sits at 61.9 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 3. 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 Anchorage has 16.3 hours of civil night and Eagle River 16.3. Across the 15th of each month, Anchorage is darker in 3 months and Eagle River in 0. The widest gap comes in July, when Anchorage has 0.1 more hours.

Hours of civil night on the 15th of each month, 2026
Month	Anchorage	Eagle River	Difference
January	15.5 h	15.5 h	+0.0 h
February	13.2 h	13.2 h	+0.0 h
March	10.6 h	10.6 h	+0.0 h
April	7.4 h	7.4 h	+0.0 h
May	3.8 h	3.7 h	+0.1 h
June	0.0 h	0.0 h	+0.0 h
July	2.1 h	2.0 h	+0.1 h
August	6.3 h	6.2 h	+0.1 h
September	9.5 h	9.5 h	+0.0 h
October	12.4 h	12.4 h	+0.0 h
November	14.9 h	14.9 h	+0.0 h
December	16.3 h	16.3 h	+0.0 h

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

Season and midnight sun

Anchorage has no civil darkness from June 2 to July 8, 37 nights in 2026, and its dark season, 4 or more evening hours of civil night, lasts 290 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 21 km apart by great circle. In the dark months both average about 72% cloud in NASA POWER's 2001 to 2020 record. Anchorage'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 Anchorage and Eagle River, which carry the live OVATION cell.

Questions

Is Anchorage or Eagle River better for the northern lights?: Eagle River sits closer to the oval, at 62.1 degrees geomagnetic against 61.9. 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, Anchorage or Eagle River?: Anchorage, with 16.3 hours of civil night on December 15 against 16.3 in Eagle River.
What Kp do Anchorage and Eagle River need?: By SWPC's rule of 66 degrees at Kp 0 and 2 degrees per step, Anchorage needs about Kp 3 and Eagle River Kp 2 for the average oval edge to sit overhead.
When is it too light for aurora in Anchorage and Eagle River?: Anchorage: June 2 to July 8. Eagle River: June 1 to July 9.
Which is clearer, Anchorage or Eagle River?: Anchorage, with 72% 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.