Weather in December
Ocean temperature
In Mystic Island, New Jersey, the average seawater temperature in December is 48.6°F (9.2°C).Note: Dipping into 48.6°F (9.2°C) below 50°F (10°C) needs protective wear, or you'd face cold shock and breathing issues swiftly. Meanwhile, a slight swim around 55.4°F (13°C) feels cold to the bone.
Daylight
December has the shortest days of the year in Mystic Island, New Jersey, with an average of 9h and 24min of daylight.On the first day of December in Mystic Island, sunrise is at 6:59 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:43 pm EST.
Frequently asked questions
How cold is the water in December in Mystic Island?
In December, the average ocean temperature in Mystic Island is 48.6°F (9.2°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.
What is the month with the shortest days in Mystic Island?
December has the shortest days of the year in Mystic Island, with an average of 9h and 24min of daylight.
What is the average length of the day in December in Mystic Island?
The average day length in December is 9h and 26min.
When are sunrise and sunset in December in Mystic Island?
In December, on the first day of the month, sunrise is at 6:59 am and sunset at 4:34 pm. On the last day of the month, in Mystic Island, New Jersey, sunrise is at 7:17 am and sunset at 4:43 pm EST.
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).
Average daylight in December
Mystic Island, NJ
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
Mystic Island, New Jersey, USA
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