December weather forecast
Sterling, VA

Weather in December

The first month of the winter, December, is still a chilly month in Sterling, Virginia, with average temperature fluctuating between 45.1°F (7.3°C) and 32°F (0°C).

Temperature

In Sterling, the average high-temperature in December slightly decreases, from a cool 53.6°F (12°C) in November, to a chilly 45.1°F (7.3°C). In Sterling, Virginia, in December, the average low-temperature is 32°F (0°C).

Humidity

With an average relative humidity of 78%, December is the most humid month in Sterling.

Rainfall

In Sterling, in December, it is raining for 10.5 days, with typically 2.68" (68mm) of accumulated precipitation. Throughout the year, there are 158.1 rainfall days, and 31.46" (799mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall. In Sterling, in December, snow falls for 2.7 days, with typically accumulated 1.97" (50mm) of snow. In Sterling, Virginia, during the entire year, snow falls for 16.7 days, and aggregates up to 12.28" (312mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9.5h of daylight.

Sunshine

Months with the least sunshine in Sterling are January, February and December, with an average of 5h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to the UV radiation for the ordinary person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the most humid month in Sterling?

December is the most humid month, with an average relative humidity of 78%.

What is the average humidity in December in Sterling?

In December, the average relative humidity is 78%.

How many days does it rain in December in Sterling?

In Sterling, in December, during 10.5 rainfall days, 2.68" (68mm) of precipitation is typically accumulated.

How many days does it snow in December in Sterling?

In December, in Sterling, it is snowing for 2.7 days. Throughout December, 1.97" (50mm) of snow is accumulated.

What is the month with the shortest days in Sterling?

December has the shortest days of the year in Sterling, with an average of 9.5h of daylight.

What is the average length of the day in December in Sterling?

In December, the average length of the day is 9.5h.

What is the month with the least sunshine in Sterling?

January, February and December, with an average of 5h of sunshine, are months with the least sunshine in Sterling, Virginia.

How long on average sun shines in December in Sterling?

In December, the average sunshine in Sterling, Virginia, is 5h.

What is the month with the lowest UV index in Sterling?

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

What is the UV index intensity in December in Sterling?

In Sterling, Virginia, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to the UV radiation.

Average temperature in December
Sterling, VA

Average temperature in December - Sterling, VA
  • Average high temperature in December: 7.3°C

The warmest month (with the highest average high temperature) is July (31°C).
The month with the lowest average high temperature is January (4.3°C).

  • Average low temperature in December: 0°C

The month with the highest average low temperature is July (19.6°C).
The coldest month (with the lowest average low temperature) is January (-3.4°C).

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Average pressure in December
Sterling, VA

Average pressure in December - Sterling, VA
  • Average pressure in December: 1019.8mbar

The month with the highest atmospheric pressure is November (1020.6mbar).
The month with the lowest atmospheric pressure is June (1014.1mbar).

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Average wind speed in December
Sterling, VA

Average wind speed in December - Sterling, VA
  • Average wind speed in December: 10.6km/h

The windiest month (with the highest average wind speed) is March (12km/h).
The calmest month (with the lowest average wind speed) is August (7.6km/h).

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Average humidity in December
Sterling, VA

Average humidity in December - Sterling, VA
  • Average humidity in December: 78%

The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (70%).

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Average rainfall in December
Sterling, VA

Average rainfall in December - Sterling, VA
  • Average rainfall in December: 68mm

The wettest month (with the highest rainfall) is August (96mm).
The driest month (with the least rainfall) is September (49mm).

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Average rainfall days in December
Sterling, VA

Average rainfall days in December - Sterling, VA
  • Average rainfall days in December: 10.5 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (9.3 days).

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Average snowfall in December
Sterling, VA

Average snowfall in December - Sterling, VA
  • Average snowfall in December: 50mm

The month with the highest snowfall is January (90mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

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Average snowfall days in December
Sterling, VA

Average snowfall days in December - Sterling, VA
  • Average snowfall days in December: 2.7 days

Months with the highest number of snowfall days are January and February (5.1 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Sterling, VA

Average daylight in December / Average sunshine in December - Sterling, VA
  • Average daylight in December: 9.5h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in December: 5h

The month with the most sunshine is July (Average sunshine: 10.7h).
Months with the least sunshine are January, February and December (Average sunshine: 5).

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Average sunshine days in December
Sterling, VA

Average sunshine days in December - Sterling, VA
  • Average sunshine days in December: 17.5 days

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (11.8 days).

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Average UV index in December
Sterling, VA

Average UV index in December - Sterling, VA
  • Average UV index in December: 2

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

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Average cloud cover in December
Sterling, VA

Average cloud cover in December - Sterling, VA
  • Average cloud cover in December: 47

The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in December
Sterling, VA

Average visibility in December - Sterling, VA
  • Average visibility in December: 9km

Months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (9km).
The month with the lowest visibility is May (8km).

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