December weather forecastSea Cliff, NY

December

Weather in December

The first month of the winter, December, is also a wintry month in Sea Cliff, New York, with an average temperature ranging between min 34.7°F (1.5°C) and max 42.4°F (5.8°C).

Temperature

The onset of December brings a small shift in high-temperatures, falling from a fresh 51.1°F (10.6°C) in November to a wintry 42.4°F (5.8°C). A consistent average low of 34.7°F (1.5°C) is noted throughout December, only a small step down from its daytime high.

Humidity

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

Rainfall

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.

Snowfall

Months with snowfall are January through April, November and December. In Sea Cliff, during December, snow falls for 3.5 days and regularly aggregates up to 1.54" (39mm) of snow. Throughout the year, in Sea Cliff, there are 22.2 snowfall days, and 7.24" (184mm) of snow is accumulated.

Ocean temperature

In Sea Cliff, in December, the average water temperature is 48°F (8.9°C).
Note: Danger awaits those who swim in 48°F (8.9°C) without protection. Falling below 50°F (10°C) means intense cold shock and hyperventilation.

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 7:00 am and sunset at 4:27 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

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for average individuals.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.

Updated: Jul 24, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The high-temperature, in December, in Sea Cliff, records 42.4°F (5.8°C), while the low-temperature is 34.7°F (1.5°C). In July, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is computed 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 Sea Cliff, the average relative humidity in December 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 Sea Cliff, during December, the rain falls for 12.9 days and regularly aggregates up to 4.06" (103mm) of precipitation.

In Sea Cliff, in December, snow falls for 3.5 days, with typically accumulated 1.54" (39mm) of snow.

In Sea Cliff, the average seawater temperature in December is 48°F (8.9°C). Swimming in 48°F (8.9°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

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

In Sea Cliff, the average day length in December is 9h and 18min.

On the first day of December, sunrise is at 7:00 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:36 pm EST.

The average sunshine duration in December is 4.9h.

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

In December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to 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

0.8

3.5

6.8

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

15.5

17.3

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Sea Cliff, 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
Sea Cliff, 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
Sea Cliff, 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
Sea Cliff, 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
Sea Cliff, 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
Sea Cliff, 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
Sea Cliff, 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
Sea Cliff, 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 sea temperature in December
Sea Cliff, 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 /
Average sunshine in December
Sea Cliff, 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
Sea Cliff, 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
Sea Cliff, 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
Sea Cliff, 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
Sea Cliff, 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).