Thacher Island National Wildlife Refuge is a national wildlife refuge in Essex County, Massachusetts. It sits roughly 4.2 km (2.6 mi) ESE of Rockport.
Thacher Island National Wildlife Refuge is a National Wildlife Refuge located on Thacher Island near Rockport, Massachusetts. It is managed under the Parker River National Wildlife Refuge. The U.S. Fish and Wildlife Service currently does not offer any interpretive facilities or programs at Thacher Island Refuge. A foot trail meanders through shrub/thicket, rocky outcrop and other island habitats and affords opportunities to observe and/or photograph birds and other island and offshore wildlife. The refuge has a surface area of 22 acres (0.089 km2).From the Wikipedia article “Thacher Island National Wildlife Refuge”, licensed under CC BY-SA 4.0.
Sunrise & sunset directions
At Thacher Island National Wildlife Refuge the sunrise point swings a long way through the year: about 57° (ENE) at the June solstice and 122° (ESE) in late December. Sunset moves from 304° (NW) in June to 238° (WSW) in December, and the midday sun climbs to 71° in summer but only 24° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 6:47 AM | 90° E | 6:55 PM | 271° W | 47° | 12h 08m |
| June solstice (Jun 21) | 5:05 AM | 57° ENE | 8:24 PM | 304° NW | 71° | 15h 19m |
| September equinox (Sep 22) | 6:30 AM | 89° E | 6:42 PM | 271° W | 48° | 12h 11m |
| December solstice (Dec 21) | 7:10 AM | 122° ESE | 4:12 PM | 238° WSW | 24° | 9h 02m |
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
Wildlife is most active in the first and last two hours of daylight — exactly when the light is warmest.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 6:39 AM | 7:10 AM | 7:54 AM | 3:50 PM | 4:34 PM | 5:05 PM | 9h 24m |
| February | 6:11 AM | 6:40 AM | 7:20 AM | 4:35 PM | 5:14 PM | 5:43 PM | 10h 34m |
| March | 6:27 AM | 6:55 AM | 7:33 AM | 6:12 PM | 6:49 PM | 7:17 PM | 11h 53m |
| April | 5:32 AM | 6:02 AM | 6:40 AM | 6:46 PM | 7:24 PM | 7:53 PM | 13h 22m |
| May | 4:49 AM | 5:21 AM | 6:02 AM | 7:17 PM | 7:58 PM | 8:30 PM | 14h 37m |
| June | 4:30 AM | 5:05 AM | 5:48 AM | 7:40 PM | 8:23 PM | 8:58 PM | 15h 18m |
| July | 4:45 AM | 5:18 AM | 6:00 AM | 7:37 PM | 8:19 PM | 8:53 PM | 15h 01m |
| August | 5:19 AM | 5:50 AM | 6:29 AM | 7:07 PM | 7:46 PM | 8:16 PM | 13h 56m |
| September | 5:54 AM | 6:23 AM | 7:00 AM | 6:17 PM | 6:54 PM | 7:22 PM | 12h 31m |
| October | 6:27 AM | 6:56 AM | 7:34 AM | 5:23 PM | 6:02 PM | 6:30 PM | 11h 06m |
| November | 6:04 AM | 6:35 AM | 7:17 AM | 3:39 PM | 4:21 PM | 4:51 PM | 9h 47m |
| December | 6:34 AM | 7:06 AM | 7:52 AM | 3:25 PM | 4:10 PM | 4:42 PM | 9h 04m |
Local time (America/New York), 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
From Thacher Island National Wildlife Refuge, the Milky Way core is visible in a dark sky from March through September. June gives the longest window (about 4.0 hours on a moonless night), and the core peaks around 18° above the southern horizon. Our light-pollution model puts the sky at about Bortle 5 (suburban sky), so expect visible sky glow; drive away from towns for better results.
| Month | Core visible (15th) | Hours | Max altitude | Direction |
|---|---|---|---|---|
| January | Below 10° in darkness | — | -4° | — |
| February | Below 10° in darkness | — | 9° | — |
| March | 4:23 AM – 5:13 AM | 0.8 | 15° | SSE → SSE |
| April | 2:26 AM – 4:16 AM | 1.8 | 18° | SSE → S |
| May | 12:27 AM – 3:17 AM | 2.8 | 18° | SSE → S |
| June | 10:39 PM – 2:39 AM | 4.0 | 18° | SSE → SSW |
| July | 10:28 PM – 1:18 AM | 2.8 | 18° | S → SSW |
| August | 9:34 PM – 11:24 PM | 1.8 | 18° | S → SSW |
| September | 8:30 PM – 9:20 PM | 0.8 | 15° | SSW → SSW |
| October | Below 10° in darkness | — | 9° | — |
| November | Below 10° in darkness | — | -2° | — |
| December | Below 10° in darkness | — | -19° | — |
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: 5 Bortle 5 — Suburban sky. The Milky Way is weak near the horizon and washed out overhead; long exposures pick up a sky glow. Modeled zenith brightness ≈ 19.86 mag/arcsec². Aurora needs roughly Kp 5.5+ to show low on the northern horizon here.
Weather & best season
Long-term NASA satellite data for this area show August as the clearest month (about 48% average cloud cover) and January as the cloudiest (70%). August 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 | 58 | 56 | 67 | 76 | 79 | 84 | 88 | 89 | 86 | 77 | 67 | 62 |
| Low °F | -1 | -1 | 8 | 27 | 37 | 46 | 55 | 56 | 49 | 36 | 18 | 9 |
| Precip. (in) | 3.7 | 4.2 | 4.8 | 4.5 | 3.7 | 4.5 | 3.6 | 3.6 | 3.6 | 4.9 | 4.3 | 5.0 |
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 national wildlife refuge
- Stay on designated routes and keep a respectful distance — if an animal changes behavior, you are too close.
- A 400–600 mm lens (or a crop body) is the usual tool for birds.
- Fast shutter speeds (1/2000 s+) freeze wingbeats; raise ISO rather than lose the shot.
- Migration peaks bring the largest concentrations — see the birding calendar for this state.
- Tell someone where you're going in remote areas and carry the ten essentials.
Season: Spring and autumn migration are the highlights; winter brings waterfowl to many southern refuges.
Suggested gear: Telephoto lens (400 mm+), Bean bag for car window, Binoculars. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Permits, drones & access
Drones: Launching or landing drones on National Wildlife Refuge lands generally requires a special use permit from the refuge manager, and wildlife disturbance rules apply everywhere.
Nearby photo spots
Other locations within 40 km of Thacher Island National Wildlife Refuge, closest first.
Lighthouse
Lighthouse
Lighthouse
Ghost Town
State Park
Lighthouse
Lighthouse
Beach
LighthouseFAQ
When is the best time to photograph Thacher Island National Wildlife Refuge?
What time is golden hour at Thacher Island National Wildlife Refuge?
Where does the sun rise and set at Thacher Island National Wildlife Refuge?
Can you see the Milky Way from Thacher Island National Wildlife Refuge?
Do you need a permit to photograph at Thacher Island National Wildlife Refuge?
How far is Thacher Island National Wildlife Refuge from Rockport?
Sources
Location data: Wikidata, Wikipedia. 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.