Bar Harbor (Acadia) weather in December
Temperature, sea and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Poor
Best time to visit: June – September
What is the weather like in Bar Harbor (Acadia) in December?
In December, Bar Harbor (Acadia) is cold: daytime highs average 3 °C, and nights often drop below freezing (−3 °C). The sea averages 7.8 °C – swimming is only for the hardy. The sun is scarce, with only about 4 hours a day. Precipitation, often as snow, falls on about 12 days, totalling 123 mm. Snow falls on about 5 days. All in all, December is not an ideal month for a holiday in Bar Harbor (Acadia).
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 21 | 16 | 20 |
| Day | 8° | 3° | 0° |
| Night | 3° | −3° | −7° |
| Sea | 10° | 8° | 6° |
| Sun | 4 h | 4 h | 4 h |
| Rain days | 10 | 12 | 11 |
More details for December
- Daylight
- 8 h 52 min07:02 – 15:54
- UV index
- 1 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 26 km/haverage daily peakAll months
- Cloud cover
- 61 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 5 days1 cm or more of fresh snowAll months
- Time zone
- UTC−5America/New_York
How the score comes together
- Temperatureweight 50 %0 %
- Sunshineweight 20 %13 %
- Few rainy daysweight 30 %44 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Nature escape”.
What to pack in December
- Warm jacket
- Hat, scarf & gloves
- Rain jacket or umbrella
Bar Harbor (Acadia) in December: quick answers
Is Bar Harbor (Acadia) hot in December?
No. In December, Bar Harbor (Acadia) is cold: daytime highs average 3 °C and nights drop to about −3 °C.
Can you swim in Bar Harbor (Acadia) in December?
Only if you don't mind cold water: in December the sea averages just 7.8 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Bar Harbor (Acadia) in December?
Rain is frequent, with about 12 rainy days and 123 mm in total.
Bar Harbor (Acadia) month by month
The whole year in Bar Harbor (Acadia)All destinations: USAWhere to go in DecemberSea temperature in December
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences