Located in Yukon-Koyukuk Census Area, Alaska, Tunalkten Hot Spring is a hot spring at about 115 m (377 ft) above sea level.
Sunrise & sunset directions
At this latitude the sun does not rise or set on some days of the year, so check the monthly table below for daylight and twilight.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 8:17 AM | 88° E | 8:32 PM | 272° W | 24° | 12h 16m |
| June solstice (Jun 21) | — | — | — | — | 47° | — |
| September equinox (Sep 22) | 7:59 AM | 88° E | 8:20 PM | 273° W | 24° | 12h 20m |
| December solstice (Dec 21) | 11:58 AM | 163° SSE | 2:32 PM | 198° SSW | 0° | 2h 35m |
Azimuth is measured clockwise from true north (90° = east, 270° = west). Computed for 2026; values change by less than a degree from year to year.
Golden hour & blue hour by month
Steam is most visible on cold mornings; backlight from a low sun makes rising steam glow.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 9:52 AM | 11:13 AM | — | — | 3:40 PM | 5:00 PM | 4h 27m |
| February | 8:27 AM | 9:23 AM | 10:53 AM | 4:09 PM | 5:39 PM | 6:35 PM | 8h 16m |
| March | 7:45 AM | 8:36 AM | 9:45 AM | 7:06 PM | 8:16 PM | 9:07 PM | 11h 40m |
| April | 5:32 AM | 6:35 AM | 7:46 AM | 8:47 PM | 9:59 PM | 11:01 PM | 15h 24m |
| May | — | 4:35 AM | 6:12 AM | 10:14 PM | 11:52 PM | — | 19h 17m |
| June | — | — | 5:21 AM | 11:14 PM | — | — | — |
| July | — | 3:48 AM | 5:51 AM | 10:54 PM | 12:57 AM | — | 21h 09m |
| August | 4:37 AM | 5:54 AM | 7:12 AM | 9:31 PM | 10:49 PM | 12:06 AM | 16h 56m |
| September | 6:44 AM | 7:37 AM | 8:45 AM | 7:39 PM | 8:47 PM | 9:40 PM | 13h 10m |
| October | 8:21 AM | 9:14 AM | 10:31 AM | 5:33 PM | 6:51 PM | 7:44 PM | 9h 37m |
| November | 8:58 AM | 10:07 AM | — | — | 3:56 PM | 5:05 PM | 5h 50m |
| December | 10:08 AM | 11:50 AM | — | — | 2:34 PM | 4:17 PM | 2h 45m |
Local time (America/Anchorage), including daylight saving time. Golden hour runs from about −4° to +6° solar altitude, so the morning golden hour begins during blue hour, before sunrise.
Milky Way & night sky
The Milky Way's bright core (in Sagittarius) barely clears the southern horizon at this latitude, so focus on winter Milky Way, aurora or star trails instead.
| Month | Core visible (15th) | Hours | Max altitude | Direction |
|---|---|---|---|---|
| January | Below 10° in darkness | — | -14° | — |
| February | Below 10° in darkness | — | -11° | — |
| March | Below 10° in darkness | — | -12° | — |
| April | Below 10° in darkness | — | -11° | — |
| May | No darkness | — | — | — |
| June | No darkness | — | — | — |
| July | No darkness | — | — | — |
| August | No darkness | — | — | — |
| September | Below 10° in darkness | — | -15° | — |
| October | Below 10° in darkness | — | -13° | — |
| November | Below 10° in darkness | — | -15° | — |
| December | Below 10° in darkness | — | -22° | — |
Window when the galactic core is at least 10° high during astronomical darkness on the 15th of each month. Pick nights within a few days of the new moon. Plan exact nights with the Milky Way planner.
Estimated sky darkness: 1 Bortle 1 — Excellent dark-sky site. The Milky Way casts faint shadows; zodiacal light and airglow are obvious. Modeled zenith brightness ≈ 21.95 mag/arcsec². Aurora needs roughly Kp 0.0+ to show low on the northern horizon here.
Weather & best season
Long-term NASA satellite data for this area show March as the clearest month (about 46% average cloud cover) and October as the cloudiest (74%). July is the warmest month and January the coldest, which matters for gear, snow access and how long batteries last at night.
Average cloud cover (%)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 35 | 34 | 34 | 48 | 78 | 82 | 86 | 79 | 68 | 53 | 33 | 34 |
| Low °F | -54 | -49 | -40 | -26 | -3 | 27 | 33 | 27 | 9 | -18 | -33 | -43 |
| Precip. (in) | 1.2 | 1.7 | 1.0 | 1.4 | 1.6 | 2.4 | 3.1 | 3.4 | 2.8 | 2.3 | 1.8 | 1.7 |
Monthly climatology for the surrounding 1° grid cell from NASA POWER (MERRA-2). Mountain sites can be colder and cloudier than the cell average.
Photography tips for this hot spring
- Condensation forms quickly on lenses; let gear acclimate and carry a cloth.
- Keep to boardwalks and marked paths — crusts around thermal features can be thin and the water dangerously hot.
- A polarizer brings out the colors of mineral terraces and microbial mats.
- Respect bathers' privacy: ask before including people at soaking pools.
- Shoot RAW to keep the most latitude for high-contrast sunrise and sunset scenes.
Season: Winter gives the most dramatic steam; some primitive springs are only accessible in summer.
Suggested gear: Circular polarizer, Lens cloth, Telephoto for distant pools. Work out exposures with the depth of field, ND filter and NPF rule calculators.
FAQ
When is the best time to photograph Tunalkten Hot Spring?
What time is golden hour at Tunalkten Hot Spring?
Where does the sun rise and set at Tunalkten Hot Spring?
Can you see the Milky Way from Tunalkten Hot Spring?
Do you need a permit to photograph at Tunalkten Hot Spring?
Sources
Location data: USGS GNIS / GeoNames. Sun, moon and Milky Way times are computed by LWPhoto Atlas for 2026. Climate: NASA POWER. Sky darkness is a population-based estimate (Walker's law), not a measurement. See data sources & licenses.