December weather forecastOyster Bay, NY

December

Weather in December

December, the first month of the winter in Oyster Bay, is still a cold month, with an average temperature ranging between min 34.7°F (1.5°C) and max 42.4°F (5.8°C).

Temperature

The arrival of December corresponds with a minor reduction in the average high-temperature, down from November's fresh 51.1°F (10.6°C) to a cold 42.4°F (5.8°C). Oyster Bay records a slight downturn to an average a still icy 34.7°F (1.5°C) during the nights of December.

Humidity

February, May and December, with an average relative humidity of 75%, are the most humid months.

Rainfall

December is the month with the most rainfall. Rain falls for 12.9 days and accumulates 4.06" (103mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. In Oyster Bay, in December, snow falls for 3.5 days, with typically accumulated 1.54" (39mm) of snow. In Oyster Bay, during the entire year, snow falls for 22.2 days and aggregates up to 7.24" (184mm) of snow.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 6:59 am and sunset at 4:26 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:36 pm EST.

Sunshine

In December, the average sunshine is 4.9h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the average person.
Note: The daily high UV index of 2 during December translates into the following recommendations:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.

Updated: Jun 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In Oyster Bay, 42.4°F (5.8°C) is the average high-temperature and 34.7°F (1.5°C) is the average low-temperature during December. The average heat index (a.k.a. 'apparent temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in July is calculated to be 86°F (30°C).

The months with the highest humidity are February, May and December, with an average relative humidity of 75%.

In December, the average relative humidity is 75%.

The month with the most rainfall is December, when the rain falls for 12.9 days and typically aggregates up to 4.06" (103mm) of precipitation.

In Oyster Bay, in December, it is raining for 12.9 days, with typically 4.06" (103mm) of accumulated precipitation.

In December, it is snowing for 3.5 days. Throughout December, 1.54" (39mm) of snow is accumulated.

With an average of 9h and 18min of daylight, December has the shortest days of the year.

In Oyster Bay, the average day length in December is 9h and 18min.

In December, on the first day of the month, sunrise is at 6:59 am and sunset at 4:26 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:36 pm EST.

In Oyster Bay, the average sunshine duration in December is 4.9h.

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

In Oyster Bay, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

51.1°F

42.4°F

36.5°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

11.2mph

11.6mph

11.9mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

15.5

17.3

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Oyster Bay, NY

Average high temperature in December: 42.4°F

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (36.5°F).

Average low temperature in December: 34.7°F

The months with the highest average low temperature are July and August (70.3°F).
The coldest month (with the lowest average low temperature) is January (27.3°F).

Average pressure in December
Oyster Bay, NY

Average pressure in December: 30.07"Hg

The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in December
Oyster Bay, NY

Average wind speed in December: 10.8mph

The windiest month (with the highest average wind speed) is January (11.2mph).
The calmest month (with the lowest average wind speed) is July (7.3mph).

Average humidity in December
Oyster Bay, NY

Average humidity in December: 75%

The months with the highest relative humidity are February, May and December (75%).
The months with the lowest relative humidity are August and November (71%).

Average rainfall in December
Oyster Bay, NY

Average rainfall in December: 4.06"

The wettest month (with the highest rainfall) is December (4.06").
The driest month (with the least rainfall) is September (2.4").

Average rainfall days in December
Oyster Bay, NY

Average rainfall days in December: 12.9 days

The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is January (9.3 days).

Average snowfall in December
Oyster Bay, NY

Average snowfall in December: 1.54"

The month with the highest snowfall is March (2.01").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Oyster Bay, NY

Average snowfall days in December: 3.5 days

The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Oyster Bay, NY

Average daylight in December: 9h and 18min

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).

Average sunshine in December: 4h and 54min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days in December
Oyster Bay, NY

Average sunshine days in December: 15.5 days

The month with the most sunshine days is November (18 days).
The month with the least sunshine days is July (10.6 days).

Average UV index in December
Oyster Bay, NY

Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in December
Oyster Bay, NY

Average cloud cover in December: 47

The months with the most cloud cover are February and December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 29).

Average visibility in December
Oyster Bay, NY

Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).