Walter Hunnewell Arboretum is a botanical garden in Middlesex County, Massachusetts. It sits roughly 1.7 km (1.1 mi) SW of Wellesley.
The H. H. Hunnewell estate in Wellesley, Massachusetts was the country home of H. H. Hunnewell (1810–1902), containing over 500 species of woody plants in 53 families. The estate remains in the family, and includes the first (1854) topiary garden in the United States, featuring intricate geometrically clipped native Eastern white pine and Eastern arborvitae. A collection of specialty greenhouses feature over 1,000 plant species. The estate has been cared for by six generations of the Hunnewell family. The property is located within the Hunnewell Estates Historic District, on Washington Street in southwest Wellesley, near Boston, Massachusetts. All of the properties within the district, including the H.H. Hunnewell estate, are private residences and are not open to the public.From the Wikipedia article “H. H. Hunnewell estate”, licensed under CC BY-SA 4.0.
Sunrise & sunset directions
At Walter Hunnewell Arboretum 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) | 6:50 AM | 90° E | 6:58 PM | 271° W | 48° | 12h 08m |
| June solstice (Jun 21) | 5:10 AM | 57° ENE | 8:26 PM | 304° WNW | 71° | 15h 16m |
| September equinox (Sep 22) | 6:33 AM | 89° E | 6:44 PM | 271° W | 48° | 12h 11m |
| December solstice (Dec 21) | 7:12 AM | 122° ESE | 4:17 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
Gardens are best on bright overcast days or early mornings when dew is fresh and the wind is calm.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 6:41 AM | 7:12 AM | 7:56 AM | 3:55 PM | 4:38 PM | 5:09 PM | 9h 26m |
| February | 6:14 AM | 6:43 AM | 7:22 AM | 4:39 PM | 5:18 PM | 5:47 PM | 10h 35m |
| March | 6:30 AM | 6:58 AM | 7:35 AM | 6:15 PM | 6:52 PM | 7:20 PM | 11h 54m |
| April | 5:36 AM | 6:05 AM | 6:43 AM | 6:49 PM | 7:27 PM | 7:56 PM | 13h 21m |
| May | 4:53 AM | 5:25 AM | 6:05 AM | 7:20 PM | 8:00 PM | 8:32 PM | 14h 35m |
| June | 4:34 AM | 5:09 AM | 5:51 AM | 7:42 PM | 8:24 PM | 8:59 PM | 15h 15m |
| July | 4:49 AM | 5:23 AM | 6:04 AM | 7:39 PM | 8:21 PM | 8:55 PM | 14h 58m |
| August | 5:23 AM | 5:53 AM | 6:32 AM | 7:09 PM | 7:48 PM | 8:18 PM | 13h 55m |
| September | 5:58 AM | 6:26 AM | 7:03 AM | 6:20 PM | 6:57 PM | 7:25 PM | 12h 31m |
| October | 6:30 AM | 6:58 AM | 7:37 AM | 5:27 PM | 6:05 PM | 6:33 PM | 11h 06m |
| November | 6:06 AM | 6:37 AM | 7:19 AM | 3:43 PM | 4:25 PM | 4:55 PM | 9h 48m |
| December | 6:36 AM | 7:08 AM | 7:53 AM | 3:29 PM | 4:14 PM | 4:46 PM | 9h 06m |
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 Walter Hunnewell Arboretum, 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 | 4:25 AM – 5:15 AM | 0.8 | 15° | SSE → SSE |
| April | 2:17 AM – 4:17 AM | 2.0 | 18° | SE → S |
| May | 12:27 AM – 3:17 AM | 2.8 | 19° | SSE → S |
| June | 10:37 PM – 2:47 AM | 4.2 | 19° | SSE → SSW |
| July | 10:27 PM – 1:27 AM | 3.0 | 19° | S → SSW |
| August | 9:35 PM – 11:25 PM | 1.8 | 18° | S → SSW |
| September | 8:32 PM – 9:22 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 ≈ 18.25 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 botanical garden
- Kaleidoscopic and abstract images are great for flower close-ups — try the online kaleidoscope tool.
- A macro lens or close-up filter opens a world of detail — try a shallow aperture against a soft background.
- Many gardens restrict tripods or charge for photography; check the rules before you go.
- Backlit petals glow; position yourself so the sun is behind the flower.
- Seasonal exhibits (orchids, tulips, cherry blossoms) draw crowds — arrive at opening.
- Shoot RAW to keep the most latitude for high-contrast sunrise and sunset scenes.
Season: Spring bulbs and blossoms, summer perennials and autumn color; glasshouses offer winter subjects.
Suggested gear: Macro lens, Diffuser, Small reflector. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Nearby photo spots
Other locations within 25 km of Walter Hunnewell Arboretum, closest first.
Botanical Garden
Botanical Garden
Lake
State Park
State Park
Botanical Garden
State Park
Lake
LakeFAQ
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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.