Alaska Daylight Hours by Month & Latitude Matrix
Monthly daylight, twilight, and dark sky hours across Anchorage, Fairbanks, and Utqiagvik with aurora viewing probabilities.
Monthly daylight, twilight, and dark sky hours across Anchorage, Fairbanks, and Utqiagvik with aurora viewing probabilities.
| Month | Anchorage (61?N) | Fairbanks (64?N) | Utqia?vik (71?N) | Aurora Probability | Atmospheric Conditions |
|---|---|---|---|---|---|
| January | 5h 45m | 4h 00m | 0h 00m (Polar Night) | 95% (Peak Winter Darkness) | Deep subarctic winter; pristine dark skies for Northern Lights. |
| February | 8h 30m | 7h 45m | 3h 30m | 95% (Peak Aurora Season) | Rapidly lengthening days; clear, cold skies. |
| March | 11h 45m | 11h 30m | 10h 30m | 98% (Equinox Peak) | Spring equinox peak solar geomagnetic activity; pleasant daytime sun. |
| April | 15h 00m | 15h 30m | 16h 00m | 60% (Fades mid-month) | Spring breakup season; daylight expands by 6+ minutes daily. |
| May | 17h 45m | 18h 45m | 24h 00m (Midnight Sun) | 0% (Too Bright) | Early summer road opening; twilight throughout night. |
| June | 19h 22m | 21h 50m | 24h 00m (Midnight Sun) | 0% (Midnight Sun) | Summer Solstice peak; 24 hours of functional daylight. |
| July | 18h 45m | 20h 30m | 24h 00m (Midnight Sun) | 0% (Midnight Sun) | Warmest summer month; peak salmon runs and boat tours. |
| August | 15h 50m | 16h 45m | 18h 30m | 75% (Returns Aug 21) | Late summer; first dark skies return; fall tundra foliage begins. |
| September | 12h 45m | 12h 50m | 12h 00m | 98% (Equinox Peak) | Autumn equinox peak; golden yellow birch leaves and active auroras. |
| October | 9h 50m | 9h 15m | 7h 30m | 90% (Dark Skies) | First major snowfalls; ski resorts prepare; crisp cold viewing. |
| November | 7h 00m | 5h 30m | 0h 00m (Polar Night starts) | 95% (Deep Winter) | Subarctic winter deepens; frozen river trails and dog sledding. |
| December | 5h 28m | 3h 42m | 0h 00m (Polar Night) | 95% (Winter Solstice) | Shortest day of the year; 20+ hours of dark sky for aurora viewing. |
Latitude-Dependent Solar Geometry & Solar Noon Calculations
Alaska's dramatic seasonal daylight shifts are governed by its high subarctic and arctic latitudes (spanning 51?N in the Aleutians to 71?N at Point Barrow). During the summer solstice (June 21), Earth's northern hemisphere tilts 23.5 ? toward the sun, causing the sun to skim the horizon without setting north of the Arctic Circle (66.5?N).
In Anchorage (61.2?N), summer solstice delivers 19 hours and 22 minutes of direct sunlight. In Fairbanks (64.8?N), daylight reaches 21 hours and 50 minutes, creating the world-famous "Midnight Sun" phenomenon.
Civil Twilight vs. Nautical Twilight: Practical Driving Windows
Astronomers distinguish between three twilight phases that dictate functional visibility for road trippers:
? Civil Twilight (Sun 0 ? to 6 ? below horizon): Sufficient natural ambient light for driving, hiking, and wildlife photography without artificial headlights or flashlights. From late May through July, Southcentral and Interior Alaska remain in perpetual civil twilight throughout the entire night.
? Nautical Twilight (Sun 6 ? to 12 ? below horizon): Horizon is visible at sea; brighter navigational stars appear.
? Astronomical Darkness (Sun > 18 ? below horizon): Complete celestial dark sky required for viewing the Aurora Borealis. True astronomical darkness returns to Fairbanks on August 21 and Anchorage on August 28.
Midnight Sun Sleep Strategies & Aurora Dark-Sky Thresholds
? Managing the Midnight Sun: 24 hours of light can disrupt circadian rhythms. We recommend packing a 100% blackout sleep eye mask and requesting hotel rooms with thick blackout curtains.
? Aurora Viewing Windows: The prime window for seeing the northern lights in Interior Alaska runs from late August to mid-April. Peak solar geomagnetic activity occurs around the autumnal equinox (September 20 ? 25) and spring equinox (March 18 ? 25).
Make Alaska Travel Pros a Preferred Source
Keep Alaska itineraries and road-trip guides highlighted in Google Search.