SeasonMapHyannis (Cape Cod) weather in December
United States
December in Hyannis: cold, rainy, with clean air — one of the weakest months to visit.
#11 of 12 months in Hyannis · #1275 of 1383 destinations to visit in December · comfort 38/100 (tier F)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Hyannis in December
No notes yet. Open Hyannis on the map to add the first one.
Hyannis climate normals — December
| Daytime high | 7°C / 44°F | 🧥 cold |
|---|---|---|
| Nighttime low | -1°C / 30°F | |
| Feels like (high) | 3°C / 37°F | |
| Sea temperature | 6°C / 43°F | 🥶 cold sea |
| Rainfall | 118 mm / 4.6 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 72% | 💧 humid |
| Dew point | -1°C / 30°F | |
| Sunshine | 5.4 h/day | |
| Daylight | 9.2 h | |
| Wind | 28 km/h / 18 mph | |
| Snowfall | 4.9 cm / 1.9 in | |
| Air quality (US AQI) | 33 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Hyannis in December
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyWinter / Christmas break in United States, school holidays in 2 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Hyannis's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Toughest weatherHyannis's weather peaks June–August, best around July.
Best weatherFair weatherToughest weather
What's on in Hyannis in December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Winter shutdown
1 Nov – 15 AprOff-season shutdownClosuresMost of the seasonal restaurants and shops close and the ferry drops to the winter timetable, though Hyannis keeps more open year-round than the rest of the Cape because people actually live here. Rates halve.
Nearby, and something's on
Within 300 km of Hyannis — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Hyannis?
Hyannis in December — FAQ
- Is December a good time to visit Hyannis?
- December in Hyannis: cold, rainy, with clean air — one of the weakest months to visit. It ranks #11 of 12 months for Hyannis on SeasonMap's comfort score (38/100).
- What is the weather like in Hyannis in December?
- In December, Hyannis averages a daily high of 6.9°C and a low of -1.2°C, with about 118 mm of rain over roughly 10.6 rainy days.
- What is the air quality in Hyannis in December?
- Hyannis has a mean US Air Quality Index of about 33 in December.
- Does it snow in Hyannis in December?
- Hyannis sees roughly 4.9 cm of snowfall in December.
Other months in Hyannis
Compare Hyannis in December
Warmer or cooler than Hyannis in December
Similar destinations in North America — December
Within 300 km: Nantucket's Christmas Stroll around 27 Nov – 8 Dec, and Boston's First Night on 31 Dec – 1 Jan.