Northern lights in Delta Junction, Alaska
At the end of the Alaska Highway, Delta Junction gets about 21.5 hours of June daylight and under 4.5 in December.
Delta Junction
…Checking tonight's sky…
The next three nights
Geomagnetic activity (Kp) forecast for the selected town's dark hours. Kp runs 0–9; how much a town needs depends on its magnetic latitude. New to this? What the Kp index means, in plain words → Nights tagged “outlook” use NOAA’s 27-day outlook where the 3-day forecast doesn’t reach — whole-day values, so treat them as rougher estimates.
What Delta Junction needs for a show
Whether aurora reaches a town is mostly a matter of magnetic latitude — distance from the magnetic pole, not the geographic one. Delta Junction sits at magnetic latitude 65.2°, which puts it in the Kp 2 band: when the forecast Kp for the dark hours reaches about 2, the oval's southern edge reaches Delta Junction and displays can appear low on the northern horizon. At Kp 4 or better, expect the band overhead at times. The same law draws the band on the homepage globe: the oval's edge at magnetic latitude 69 − 3×Kp.
| Magnetic latitude | 65.2° |
|---|---|
| Kp needed (horizon show) | About 2 |
| Kp for a strong overhead show | About 4+ |
| Coordinates | 64.0378°N, 145.7322°W · Interior |
Kp is only one of four ingredients in the live call above: cloud cover over the dark hours, the town's actual darkness window, and moonlight all count too. A Kp 4 night under solid cloud is still a no — which is why the verdict, not the index, leads this page.
Delta Junction’s aurora season
Delta Junction has a real off-season: from about Apr 10 to Sep 1 (145 nights) the sun never dips 18° below the horizon, so it never gets truly dark and aurora can't be seen even when it's active. Outside that stretch, 220 nights in 2027 get a true-dark window.
| Month (2027) | True darkness | Typical dark window, mid-month |
|---|---|---|
| January | Every night | 12 hr 14 min |
| February | Every night | 9 hr 54 min |
| March | Every night | 6 hr 40 min |
| April | 9 of 30 nights | — |
| May | No true darkness | — |
| June | No true darkness | — |
| July | No true darkness | — |
| August | No true darkness | — |
| September | 29 of 30 nights | 4 hr 52 min |
| October | Every night | 8 hr 54 min |
| November | Every night | 11 hr 37 min |
| December | Every night | 12 hr 54 min |
True darkness = the sun below −18° (end of astronomical twilight), computed with the standard NOAA solar algorithm for Delta Junction’s coordinates. The live call at the top of this page uses tonight's actual window, not these averages.
Delta Junction in daylight
Sunrise, sunset, and daylight hours for Delta Junction — today or any date — are on our sister site: Delta Junction at Alaska Daylight →
On the water nearby
Night fishing or camping out of Delta Junction? The nearest tide station is VALDEZ, Port Valdez (202 mi S) — tide predictions and minus tides at Alaska Tide Charts.