December weather forecast and climate
Mystic Island, NJ

Weather in December

Ocean temperature

In Mystic Island, New Jersey, in December, the average water temperature is 48.6°F (9.2°C).
Note: Swimming in 48.6°F (9.2°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

December has the shortest days of the year in Mystic Island, with an average of 9.4h of daylight.
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FAQ

What is the water temperature in December in Mystic Island?

In Mystic Island, New Jersey, the average seawater temperature in December is 48.6°F (9.2°C). Swimming in 48.6°F (9.2°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the month with the shortest days in Mystic Island?

With an average of 9.4h of daylight, December has the shortest days of the year in Mystic Island.

What is the average length of the day in December in Mystic Island?

In December, the average length of the day in Mystic Island is 9.4h.

Average sea temperature in December
Mystic Island, NJ

Average sea temperature in December - Mystic Island, NJ
  • Average sea temperature in December: 48.5°F

The best month for swimming (with the highest average sea temperature) is August (75.8°F).
The coldest month (with the lowest average sea temperature) is February (40.8°F).

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Average daylight in December
Mystic Island, NJ

Average daylight in December - Mystic Island, NJ
  • Average daylight in December: 9.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

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