December weather forecast and climate
Sea Cliff, NY

The first month of the winter, December, is still a cold month in Sea Cliff, New York, with average temperature fluctuating between 34.7°F (1.5°C) and 42.4°F (5.8°C).

Temperature

In Sea Cliff, the average high-temperature slightly decreases, from a cool 51.1°F (10.6°C) in November, to a cold 42.4°F (5.8°C). In Sea Cliff, in December, the average low-temperature is 34.7°F (1.5°C).

Humidity

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

Rainfall

December is the month with the most rainfall in Sea Cliff. 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 Sea Cliff, during December, snow falls for 3.5 days and regularly aggregates up to 1.54" (39mm) of snow. In Sea Cliff, during the entire year, snow falls for 22.2 days, and aggregates up to 7.24" (184mm) of snow.

Ocean temperature

In Sea Cliff, the average seawater temperature 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.

Daylight

The month with the shortest days in Sea Cliff is December, with an average of 9.3h of daylight.

Sunshine

In Sea Cliff, the average sunshine in December 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 in Sea Cliff. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to the Sun's UV rays for average individuals.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in December in Sea Cliff?

In December, in Sea Cliff, the average high-temperature is 42.4°F (5.8°C), and the average low-temperature is 34.7°F (1.5°C).

What is the most humid month in Sea Cliff?

Months with the highest humidity in Sea Cliff, New York, are February, May and December, with an average relative humidity of 75%.

What is the average humidity in December in Sea Cliff?

In Sea Cliff, New York, the average relative humidity in December is 75%.

How much does it rain in Sea Cliff in December?

In Sea Cliff, in December, during 12.9 rainfall days, 4.06" (103mm) of precipitation is typically accumulated.

What is the wettest month in Sea Cliff?

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

How much does it snow in Sea Cliff in December?

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

What is the water temperature in December in Sea Cliff?

In December, the average ocean temperature in Sea Cliff, New York, 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.

What is the month with the shortest days in Sea Cliff?

December has the shortest days of the year, with an average of 9.3h of daylight.

How many hours of daylight does Sea Cliff have in December?

In Sea Cliff, New York, the average length of the day in December is 9.3h.

How many hours of sunshine does Sea Cliff have in December?

In December, the average sunshine is 4.9h.

What are the months with the lowest UV index in Sea Cliff?

Months with the lowest UV index in Sea Cliff, New York, are January through March, November and December, with an average maximum UV index of 2.

What is the UV index reading in December in Sea Cliff?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health risk from the exposure to the Sun's UV rays.
Average temperature in December - Sea Cliff, NY
  • Average high temperature in December: 5.8°C

The warmest month (with the highest average high temperature) is July (27.5°C).
The month with the lowest average high temperature is January (2.5°C).

  • Average low temperature in December: 1.5°C

Months with the highest average low temperature are July and August (21.3°C).
The coldest month (with the lowest average low temperature) is January (-2.6°C).

Average pressure in December - Sea Cliff, NY
  • Average pressure in December: 1018.2mbar

The month with the highest atmospheric pressure is November (1019.2mbar).
The month with the lowest atmospheric pressure is June (1013.6mbar).

Average wind speed in December - Sea Cliff, NY
  • Average wind speed in December: 17.4km/h

The windiest month (with the highest average wind speed) is January (18km/h).
The calmest month (with the lowest average wind speed) is July (11.7km/h).

Average humidity in December - Sea Cliff, NY
  • Average humidity in December: 75%

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

Average rainfall in December - Sea Cliff, NY
  • Average rainfall in December: 103mm

The wettest month (with the highest rainfall) is December (103mm).
The driest month (with the least rainfall) is September (61mm).

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: 39mm

The month with the highest snowfall is March (51mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

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).
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: 8.9°C

The best month for swimming (with the highest average sea temperature) is August (23.4°C).
The coldest month (with the lowest average sea temperature) is February (4.4°C).

Average daylight in December / Average sunshine in December - Sea Cliff, NY
  • Average daylight in December: 9.3h

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

  • Average sunshine in December: 4.9h

The month with the most sunshine is July (Average sunshine: 10.7h).
The month with the least sunshine is February (Average sunshine: 4.8h).

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

Months with the highest UV index are June, July and August (UV index 6).
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

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

Average visibility in December - Sea Cliff, NY
  • Average visibility in December: 9km

Months with the highest visibility are August, September and November (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, October and December (9km).