Weather in December
Ocean temperature
In Greenport West, New York, in December, the average water temperature is 48.9°F (9.4°C).Note: If planning to swim in 48.9°F (9.4°C) under 50°F (10°C), wear a protective suit. Neglecting this advice might cause immediate cold shock and troubled breathing. A splash around 55.4°F (13°C) is not much warmer.
Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 6:55 am and sunset at 4:21 pm. On the last day of December, sunrise is at 7:14 am and sunset at 4:31 pm EST.
Updated: Aug 11, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the water temperature in December?
In December, the average ocean temperature is 48.9°F (9.4°C). Swimming in 48.9°F (9.4°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?
The month with the shortest days is December, with an average of 9h and 18min of daylight.
What is the average length of the day in December?
In Greenport West, New York, the average day length in December is 9h and 17min.
When are sunrise and sunset in December?
On the first day of December, sunrise is at 6:55 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 4:31 pm EST.
Average sea temperature in December
Greenport West, NY
- Average sea temperature in December: 48.9°F
The best month for swimming (with the highest average sea temperature) is August (72.1°F).
The coldest month (with the lowest average sea temperature) is February (38.8°F).
Average daylight in December
Greenport West, NY
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
Greenport West, New York, USA
Weather forecast for your location
1. Click Locate me button
2. Allow the app to use your location
2. Allow the app to use your location