December weather forecast
Long Island, VA

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Weather in December

December, the first month of the winter in Long Island, is also a frosty month, with temperature in the range of an average low of 33.8°F (1°C) and an average high of 48°F (8.9°C).

Temperature

As November transitions into December, Long Island sees a gentle drop in the average high-temperature, transitioning from a mild 55.9°F (13.3°C) to a frosty 48°F (8.9°C). Long Island's nights in December cool down to an average low-temperature of 33.8°F (1°C).

Humidity

The months with the highest humidity are May and December, with an average relative humidity of 76%.

Rainfall

In December, the rain falls for 10.8 days. Throughout December, 2.91" (74mm) of precipitation is accumulated. Throughout the year, there are 158 rainfall days, and 30.55" (776mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Long Island are January through April, October through December. In Long Island, during December, snow falls for 1.3 days and regularly aggregates up to 1.93" (49mm) of snow. In Long Island, during the entire year, snow falls for 11.7 days and aggregates up to 8.86" (225mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 42min of daylight.
On the first day of December, sunrise is at 7:11 am and sunset at 4:59 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 5:09 pm EST.

Sunshine

The months with the least sunshine in Long Island are January and December, with an average of 5.5h of sunshine.

UV index

January, February 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 low threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: A maximum daily UV index of 2 during December morphs into the following directions:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Updated: Jun 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Long Island in December?

In Long Island, 48°F (8.9°C) is the average high-temperature and 33.8°F (1°C) is the average low-temperature during December. In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, is computed to be 98.6°F (37°C).

What are the most humid months?

The months with the highest humidity are May and December, with an average relative humidity of 76%.

What is the average humidity in December?

The average relative humidity in December is 76%.

How many days does it rain in December?

In Long Island, in December, during 10.8 rainfall days, 2.91" (74mm) of precipitation is typically accumulated.

How many days does it snow in December?

In December, it is snowing for 1.3 days. Throughout December, 1.93" (49mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 42min of daylight.

How many hours of daylight does Long Island have in December?

The average day length in December is 9h and 40min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:11 am and sunset at 4:59 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 5:09 pm EST.

What is the month with the least sunshine?

The months with the least sunshine are January and December, with an average of 5.5h of sunshine.

How long on average sun shines in December?

The average sunshine duration in December is 5.5h.

What is the month with the lowest UV index?

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

What is the UV index intensity in December?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Long Island, VA

Average temperature in December - Long Island, VA
  • Average high temperature in December: 48°F

The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is January (43.5°F).

  • Average low temperature in December: 33.8°F

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (28.6°F).

Average pressure in December
Long Island, VA

Average pressure in December - Long Island, VA
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).

Average wind speed in December
Long Island, VA

Average wind speed in December - Long Island, VA
  • Average wind speed in December: 6mph

The windiest month (with the highest average wind speed) is April (6.9mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).

Average humidity in December
Long Island, VA

Average humidity in December - Long Island, VA
  • Average humidity in December: 76%

The months with the highest relative humidity are May and December (76%).
The month with the lowest relative humidity is July (69%).

Average rainfall in December
Long Island, VA

Average rainfall in December - Long Island, VA
  • Average rainfall in December: 2.91"

The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is September (1.73").

Average rainfall days in December
Long Island, VA

Average rainfall days in December - Long Island, VA
  • Average rainfall days in December: 10.8 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is November (9.3 days).

Average snowfall in December
Long Island, VA

Average snowfall in December - Long Island, VA
  • Average snowfall in December: 1.93"

The month with the highest snowfall is January (2.28").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Long Island, VA

Average snowfall days in December - Long Island, VA
  • Average snowfall days in December: 1.3 days

The month with the highest number of snowfall days is February (3.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Long Island, VA

Average daylight in December / Average sunshine in December - Long Island, VA
  • Average daylight in December: 9h and 4min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).

  • Average sunshine in December: 5h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 30min).

Average sunshine days in December
Long Island, VA

Average sunshine days in December - Long Island, VA
  • Average sunshine days in December: 18.5 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is May (11 days).

Average UV index in December
Long Island, VA

Average UV index in December - Long Island, VA
  • Average UV index in December: 2

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

Average cloud cover in December
Long Island, VA

Average cloud cover in December - Long Island, VA
  • Average cloud cover in December: 41

The month with the most cloud cover is March (Cloud cover 43).
The months with the least cloud cover are June and July (Cloud cover 30).

Average visibility in December
Long Island, VA

Average visibility in December - Long Island, VA
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).

Long Island, Virginia, USA

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