December weather forecast
Washington, VA

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Weather in December

The first month of the winter, December, is still a chilly month in Washington, Virginia, with an average temperature ranging between max 43.7°F (6.5°C) and min 30°F (-1.1°C).

Temperature

The onset of December results in a small decrease in the average high-temperature, moderately receding from a fresh 52.5°F (11.4°C) in November to a chilly 43.7°F (6.5°C). December nights experience a consistent temperature drop to a freezing cold 30°F (-1.1°C).

Humidity

The average relative humidity in December is 78%.

Rainfall

In Washington, during December, the rain falls for 8.5 days and regularly aggregates up to 1.46" (37mm) of precipitation. In Washington, during the entire year, the rain falls for 146.8 days and collects up to 21.02" (534mm) of precipitation.

Snowfall

Months with snowfall in Washington are January through May, October through December. In Washington, in December, snow falls for 2.8 days, with typically accumulated 1.89" (48mm) of snow. In Washington, during the entire year, snow falls for 17.4 days and aggregates up to 9.72" (247mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 30min of daylight.
On the first day of the month, sunrise is at 7:12 am and sunset at 4:51 pm. On the last day of December, sunrise is at 7:30 am and sunset at 5:01 pm EST.

Sunshine

The month with the least sunshine is December, with an average of 5.1h of sunshine.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, the maximum UV index of 2 suggests these recommendations:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
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Frequently asked questions

How cold is it in Washington in December?

The high-temperature, in December, in Washington, is 43.7°F (6.5°C), while the low-temperature averages to 30°F (-1.1°C). In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is computed to be 89.6°F (32°C).

What is the average humidity in December in Washington?

In Washington, Virginia, the average relative humidity in December is 78%.

How much does it rain in Washington in December?

In Washington, Virginia, in December, it is raining for 8.5 days, with typically 1.46" (37mm) of accumulated precipitation.

How much does it snow in Washington in December?

In Washington, during December, snow falls for 2.8 days and regularly aggregates up to 1.89" (48mm) of snow.

What is the month with the shortest days in Washington?

The month with the shortest days in Washington is December, with an average of 9h and 30min of daylight.

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

In December, the average day length in Washington is 9h and 31min.

When are sunrise and sunset in December in Washington?

In December, on the first day of the month, sunrise is at 7:12 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 5:01 pm EST.

What is the month with the least sunshine in Washington?

With an average of 5.1h of sunshine, December has the least sunshine of the year in Washington, Virginia.

How many hours of sunshine does Washington have in December?

The average sunshine duration in December is 5.1h.

What are the months with the lowest UV index in Washington?

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

What is the UV index reading in December in Washington?

In Washington, 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 UV radiation.
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
Washington, VA

Average temperature in December - Washington, VA
  • Average high temperature in December: 43.7°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (38.7°F).

  • Average low temperature in December: 30°F

The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).

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Average pressure in December
Washington, VA

Average pressure in December - Washington, VA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

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Average wind speed in December
Washington, VA

Average wind speed in December - Washington, VA
  • Average wind speed in December: 5.8mph

The windiest months (with the highest average wind speed) are February and March (6.7mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).

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Average humidity in December
Washington, VA

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

The month with the highest relative humidity is October (79%).
The months with the lowest relative humidity are April and July (74%).

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Average rainfall in December
Washington, VA

Average rainfall in December - Washington, VA
  • Average rainfall in December: 1.46"

The wettest month (with the highest rainfall) is May (2.64").
The driest month (with the least rainfall) is January (0.94").

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Average rainfall days in December
Washington, VA

Average rainfall days in December - Washington, VA
  • Average rainfall days in December: 8.5 days

The month with the highest number of rainy days is August (17.8 days).
The month with the least rainy days is January (6.8 days).

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Average snowfall in December
Washington, VA

Average snowfall in December - Washington, VA
  • Average snowfall in December: 1.89"

The month with the highest snowfall is March (2.56").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Washington, VA

Average snowfall days in December - Washington, VA
  • Average snowfall days in December: 2.8 days

The month with the highest number of snowfall days is January (5 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Washington, VA
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).

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Average sunshine days in December
Washington, VA

Average sunshine days in December - Washington, VA
  • Average sunshine days in December: 20.1 days

The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is August (11.4 days).

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Average UV index in December
Washington, VA

Average UV index in December - Washington, 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, November and December (UV index 2).

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Average cloud cover in December
Washington, VA

Average cloud cover in December - Washington, VA
  • Average cloud cover in December: 45

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in December
Washington, VA

Average visibility in December - Washington, VA
  • Average visibility in December: 5mi

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

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Washington, Virginia, USA

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