Great Blue Hill is a mountain peak in Norfolk County, Massachusetts at about 183 m (600 ft) above sea level. It sits roughly 3.6 km (2.2 mi) SSE of Readville.
Great Blue Hill is a hill of 635 feet (194 m) located within the Blue Hills Reservation in Milton, Randolph and Canton, Massachusetts, about 10 miles (16 km) south of downtown Boston. It is the highest point in Norfolk County, and the Greater Boston area, and the tallest of the 22 hills that make up the Blue Hills chain in the Blue Hills Reservation. The modern name for the hill was given by early English colonists who, while sailing along the coastline, noticed the bluish hue of the exposed granite faces when viewed from a distance (due to Riebeckite). The Blue Hills' eastern slopes face the ocean and lie within Quincy. The area once attracted quarrying for its "blue granite". Great Blue Hill was a point of reference for the Indians, and the local tribe were known as the "people at the large hill" (Massachuseuck). The English called them the Massachusetts, which ultimately became...From the Wikipedia article “Great Blue Hill”, licensed under CC BY-SA 4.0.
Sunrise & sunset directions
At Great Blue Hill 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° (WNW) in June to 239° (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) | 6:49 AM | 90° E | 6:57 PM | 271° W | 48° | 12h 08m |
| June solstice (Jun 21) | 5:09 AM | 57° ENE | 8:25 PM | 304° WNW | 71° | 15h 16m |
| September equinox (Sep 22) | 6:32 AM | 89° E | 6:44 PM | 271° W | 48° | 12h 11m |
| December solstice (Dec 21) | 7:11 AM | 122° ESE | 4:16 PM | 239° WSW | 24° | 9h 05m |
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
Summits catch first and last light — alpenglow can turn rock pink or orange minutes before sunrise and after sunset while valleys stay in shadow.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 6:40 AM | 7:11 AM | 7:55 AM | 3:54 PM | 4:38 PM | 5:09 PM | 9h 26m |
| February | 6:13 AM | 6:42 AM | 7:21 AM | 4:38 PM | 5:17 PM | 5:46 PM | 10h 35m |
| March | 6:30 AM | 6:57 AM | 7:35 AM | 6:14 PM | 6:51 PM | 7:19 PM | 11h 54m |
| April | 5:35 AM | 6:04 AM | 6:42 AM | 6:48 PM | 7:26 PM | 7:55 PM | 13h 21m |
| May | 4:52 AM | 5:24 AM | 6:05 AM | 7:19 PM | 7:59 PM | 8:31 PM | 14h 35m |
| June | 4:34 AM | 5:08 AM | 5:51 AM | 7:41 PM | 8:23 PM | 8:58 PM | 15h 15m |
| July | 4:49 AM | 5:22 AM | 6:03 AM | 7:39 PM | 8:20 PM | 8:53 PM | 14h 58m |
| August | 5:22 AM | 5:53 AM | 6:31 AM | 7:09 PM | 7:47 PM | 8:17 PM | 13h 54m |
| September | 5:57 AM | 6:25 AM | 7:02 AM | 6:19 PM | 6:56 PM | 7:24 PM | 12h 31m |
| October | 6:29 AM | 6:58 AM | 7:36 AM | 5:26 PM | 6:04 PM | 6:32 PM | 11h 07m |
| November | 6:06 AM | 6:36 AM | 7:18 AM | 3:42 PM | 4:24 PM | 4:54 PM | 9h 49m |
| December | 6:35 AM | 7:07 AM | 7:52 AM | 3:29 PM | 4:14 PM | 4:46 PM | 9h 07m |
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 Great Blue Hill, the Milky Way core is visible in a dark sky from March through September. June gives the longest window (about 4.2 hours on a moonless night), and the core peaks around 19° above the southern horizon. Our light-pollution model puts the sky at about Bortle 8 (city 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 | — | -3° | — |
| February | Below 10° in darkness | — | 9° | — |
| March | 4:24 AM – 5:14 AM | 0.8 | 15° | SSE → SSE |
| April | 2:16 AM – 4:16 AM | 2.0 | 18° | SE → S |
| May | 12:26 AM – 3:16 AM | 2.8 | 19° | SSE → S |
| June | 10:36 PM – 2:46 AM | 4.2 | 19° | SSE → SSW |
| July | 10:26 PM – 1:26 AM | 3.0 | 19° | S → SSW |
| August | 9:34 PM – 11:24 PM | 1.8 | 18° | S → SSW |
| September | 8:31 PM – 9:21 PM | 0.8 | 15° | SSW → SSW |
| October | Below 10° in darkness | — | 9° | — |
| November | Below 10° in darkness | — | -1° | — |
| 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: 8 Bortle 8 — City sky. Only bright constellations are visible; the sky glows orange or white. Modeled zenith brightness ≈ 18.24 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 September as the clearest month (about 51% average cloud cover) and May as the cloudiest (64%). 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 | 64 | 65 | 75 | 86 | 89 | 93 | 98 | 100 | 97 | 86 | 72 | 67 |
| Low °F | -12 | -15 | -3 | 18 | 31 | 40 | 50 | 50 | 41 | 22 | 10 | -4 |
| Precip. (in) | 3.1 | 3.7 | 4.2 | 4.2 | 3.7 | 4.5 | 3.6 | 3.6 | 3.7 | 4.8 | 3.9 | 4.4 |
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 mountain peak
- Afternoon thunderstorms are common in summer at high elevations — plan summit hikes for early morning.
- Snow on the summit holds detail best when you expose for the highlights and lift shadows later.
- Alpenglow lasts only a few minutes; set up and focus beforehand.
- Clouds around the summit add drama — a clear blue sky is often the least interesting condition.
- Scout in daylight if you plan to shoot at night or before sunrise.
Season: Early summer keeps snow on the peaks with green valleys below; autumn adds aspen or larch color in many ranges.
Suggested gear: Telephoto lens, Lightweight tripod, Warm layers, Microspikes in shoulder seasons. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Nearby photo spots
Other locations within 25 km of Great Blue Hill, closest first.
State Park
Botanical Garden
Lake
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State Park
Lake
State Park
Botanical Garden
State ParkFAQ
When is the best time to photograph Great Blue Hill?
What time is golden hour at Great Blue Hill?
Where does the sun rise and set at Great Blue Hill?
Can you see the Milky Way from Great Blue Hill?
Do you need a permit to photograph at Great Blue Hill?
How far is Great Blue Hill from Readville?
Sources
Location data: Wikidata, USGS GNIS / GeoNames, 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.