Weather in December
December marks the return of winter conditions at Cape Cod National Seashore. With a significant plunge in sea temperature to 46.1°F (7.8°C), the cold weather asserts its dominance. Daylight diminishes, averaging 9.2 hours per day, creating shorter days and longer nights. Tumbled between November's cold incline and January's bone-chilling cold, December exhibits a robust transition to the frigid winter months.
Note: Staying in 46°F (7.8°C) waters for just a few moments at 55.4°F (13°C) can be harrowing, and below 50°F (10°C) poses breathing and cold shock risks, depending on individual tolerance.
On the first day of the month, sunrise is at 6:48 am and sunset at 4:09 pm. On the last day of December, sunrise is at 7:07 am and sunset at 4:18 pm EST.
[Resources]Ocean temperature
In Cape Cod National Seashore, in December, the average water temperature is 46°F (7.8°C).Note: Staying in 46°F (7.8°C) waters for just a few moments at 55.4°F (13°C) can be harrowing, and below 50°F (10°C) poses breathing and cold shock risks, depending on individual tolerance.
Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year in Cape Cod National Seashore.On the first day of the month, sunrise is at 6:48 am and sunset at 4:09 pm. On the last day of December, sunrise is at 7:07 am and sunset at 4:18 pm EST.
Frequently asked questions
How cold is the water in December in Cape Cod National Seashore?
In Cape Cod National Seashore, the average seawater temperature in December is 46°F (7.8°C). Swimming in 46°F (7.8°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.
What is the month with the shortest days in Cape Cod National Seashore?
December has the shortest days of the year in Cape Cod National Seashore, Massachusetts, with an average of 9h and 12min of daylight.
How many hours of daylight does Cape Cod National Seashore have in December?
In December, the average day length in Cape Cod National Seashore, Massachusetts, is 9h and 11min.
When are sunrise and sunset in December in Cape Cod National Seashore?
In December, on the first day of the month, sunrise is at 6:48 am and sunset at 4:09 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 4:18 pm EST.
Average sea temperature in December
Cape Cod National Seashore, MA
- Average sea temperature in December: 46.1°F
The best month for swimming (with the highest average sea temperature) is August (67.5°F).
The coldest month (with the lowest average sea temperature) is March (39°F).
Average daylight in December
Cape Cod National Seashore, MA
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
Cape Cod National Seashore, Massachusetts, USA
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