Roslyn Harbor
New York, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Roslyn Harbor, NY

Ocean temperature

In Diciembre, the average ocean temperature in Roslyn Harbor, New York, is 48°F (8.9°C).
Note: Swimming in 48°F (8.9°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.


With an average of 9.3h of daylight, Diciembre has the shortest days of the year in Roslyn Harbor.

What is the water temperature in Diciembre in Roslyn Harbor?

In Roslyn Harbor, in Diciembre, the average water temperature is 48°F (8.9°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 Roslyn Harbor?

Diciembre has the shortest days of the year in Roslyn Harbor, with an average of 9.3h of daylight.

How many hours of daylight does Roslyn Harbor have in Diciembre?

In Diciembre, the average length of the day in Roslyn Harbor is 9.3h.
Average sea temperature in December - Roslyn Harbor, NY
  • Average sea temperature in December: 48.1°F

The best month for swimming (with the highest average sea temperature) is August (74.1°F).
The coldest month (with the lowest average sea temperature) is February (39.9°F).

Average daylight in December - Roslyn Harbor, NY
  • Average daylight in December: 9.3h

The month with the longest days is June (Average daylight: 15.1h).
The month with shortest days is December (Average daylight: 9.3h).