Best time to see the northern lights in Tetlin, United States

Updated • 21:02 UTC

Tetlin gets the aurora on 43.2 clear nights in a typical year. March is the best month at 8.32 of them, and nights were counted at Kp 2 or higher, which the planetary index last reached on 7 September 2026.

Typical-year figures: a 1996–2026 planetary Kp record crossed with a 2001–2020 cloud normal. They describe a normal year, not tonight — the live Tetlin forecast shows the actual cloud, moon and darkness right now. Check tonight's forecast for Tetlin →

🌌 Clear nights a year

43.2

Excellent — 43.2 clear aurora nights in a typical year Compare with United States

🌟 Best Month

March

8.32 clear nights in a typical year

🌙 Peak Hours

23:00-01:00

Magnetic midnight

⚡ Required Kp

Kp 2.0–4.0

Served for the live forecast; nights counted at Kp 2, last reached 7 September 2026

🧭 Auroral oval (model)

Overhead

Model estimate at Kp 2

Month by month in Tetlin

Astronomical darkness, the nights on which planetary Kp reached Kp 2 inside that darkness, the local cloud normal, and what the cloud leaves of the count.

Month	Astronomical darkness	Opportunity nights	Mean cloud	Clear opportunity nights	Moon-free
January	12.07h	19.65	61.8%	7.51	53.4%
February	9.92h	17.86	59.6%	7.22	53.1%
March	6.59h	17.47	52.4%	8.32	55.1%
April	2.77h on 36% of nights	3.13	60.2%	1.25	53.3%
May	No astronomical darkness	—	72.6%	—	—
June	No astronomical darkness	—	75.9%	—	—
July	No astronomical darkness	—	78.5%	—	—
August	1.28h on 7.5% of nights	0	74.8%	0	—
September	5.14h	14.86	73.4%	3.95	57.3%
October	9.06h	17.6	78.7%	3.75	55.7%
November	11.6h	17.89	70.3%	5.31	53.9%
December	12.72h	16.78	64.9%	5.89	52.9%

May, June and July never reach astronomical darkness at Tetlin, so no Kp value makes them viewing months and they are excluded rather than scored.

Opportunity nights are the whole 1996–2026 record. In the current solar cycle alone (since 2023), March has averaged 24.16 rather than 17.47.

March: 6.59h of astronomical darkness a night
March: 17.47 nights reach the Kp threshold inside that darkness
March: 52.4% mean cloud leaves 8.32 of them clear
March: 55.1% of those nights are moon-free

Similar timing: Anderson , Severomorsk , Gällivare

Higher-odds destinations: Fairbanks , Yellowknife , Tromsø

Nearby in Alaska

The strongest tracked locations in the same region, by clear aurora nights a year.

Venetie — 75.9 clear nights a year, Kp 1
Ambler — 74 clear nights a year, Kp 2
Allakaket — 71.7 clear nights a year, Kp 1
Alatna — 71.6 clear nights a year, Kp 1
Kobuk — 70.3 clear nights a year, Kp 2
Shungnak — 70.3 clear nights a year, Kp 2

Aurora season across Alaska →

How these numbers were made

Evaluated at: Tetlin, 63.1375° N 142.5236° W — darkness and cloud are properties of that point, not of a region.
Darkness: Sun at or below 18° under the horizon (astronomical twilight), sampled every 10 minutes across every year of the Kp record and averaged per night of each month rather than on one representative day.
Geomagnetic record: GFZ Potsdam planetary Kp index, 3-hourly, 1996–2026 — 89,662 intervals, licensed CC BY 4.0.
Cloud: NASA POWER 20-year monthly climatology (2001–2020), parameter CLOUD_AMT. A monthly mean, not a forecast.
Moon: A night counts as moon-free below 35% lunar illumination while the moon is up.
Auroral oval: NOAA auroral-oval model, equatorward boundary near magnetic latitude 67 − 2 × Kp. A model estimate shown beside the measured record; it never replaces it.
Clear opportunity nights: Nights on which at least one 3-hour Kp interval falls inside local astronomical darkness and reaches the count threshold, scaled by one minus the monthly mean cloud amount.
Kp threshold: Nights were counted at Kp 2 or higher, the same threshold the live forecast serves.
Dataset version: Version 2026-09-07, computed offline from the closed record — the page is regenerated, not forecast.

Kp record: GFZ Potsdam (CC BY 4.0). Cloud normal: NASA POWER. How the live forecast is built: methodology page.

Frequently Asked Questions

When can you see the northern lights in Tetlin?

March is the best month, with 8.32 clear nights in a typical year out of 43.2 across the whole year. Every month except May, June, July and August carries some chance. May, June and July never reach astronomical darkness, so no Kp value makes them viewing months.

What Kp is needed to see the aurora from Tetlin?

Tetlin needs Kp 2 or higher for aurora, Kp 3 for a noticeable display and Kp 4 for a bright one. The NOAA auroral-oval model places the oval overhead at Tetlin once the planetary index reaches Kp 2. That is a model estimate; the dates on this page come from the measured Kp record instead.

Has the aurora ever been visible from Tetlin?

Yes. In the 1996–2026 planetary Kp record the index reached Kp 2, the threshold these nights were counted at for Tetlin, most recently on 7 September 2026. Whether anyone saw it also depended on the cloud, moonlight and darkness of that night, which the Kp record does not carry.