December weather forecast
Arlington, WA

Large iconic Arlington Memorial Bridge over the vast Potomac River in Washington, mirror images of the iconic Lincoln Memorial
Large iconic Arlington Memorial Bridge over the vast Potomac River in Washington, mirror images of the iconic Lincoln Memorial

Weather in December

December, the first month of the winter, in Arlington, is still a cold month, with temperature in the range of an average low of 34°F (1.1°C) and an average high of 41.7°F (5.4°C).

Temperature

The coldest month is December, with an average high-temperature of 41.7°F (5.4°C) and an average low-temperature of 34°F (1.1°C).

Humidity

Months with the highest humidity in Arlington are January, February, November and December, with an average relative humidity of 85%.

Rainfall

In Arlington, during 19.4 rainfall days, 4.53" (115mm) of precipitation is typically accumulated. In Arlington, during the entire year, the rain falls for 188.6 days and collects up to 34.92" (887mm) of precipitation.

Snowfall

Months with snowfall in Arlington are January through April, November and December. In Arlington, during December, snow falls for 2 days and regularly aggregates up to 0.67" (17mm) of snow. In Arlington, Washington, during the entire year, snow falls for 11.6 days, and aggregates up to 9.61" (244mm) of snow.

Daylight

With an average of 8.4h of daylight, December has the shortest days of the year.

Sunshine

With an average of 4.1h of sunshine, December has the least sunshine of the year in Arlington.

UV index

January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Arlington. A UV Index of 2, and less, symbolizes a low health risk from the exposure to the Sun's UV radiation for the average person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Arlington?

December is the coldest month in Arlington, Washington, with an average high-temperature of 41.7°F (5.4°C) and an average low-temperature of 34°F (1.1°C).

What are the most humid months in Arlington?

January, February, November and December, with an average relative humidity of 85%, are most humid months.

What is the average humidity in December in Arlington?

In Arlington, the average relative humidity in December is 85%.

How many days does it rain in December in Arlington?

In Arlington, Washington, in December, it is raining for 19.4 days, with typically 4.53" (115mm) of accumulated precipitation.

How many days does it snow in December in Arlington?

In Arlington, in December, snow falls for 2 days, with typically accumulated 0.67" (17mm) of snow.

What is the month with the shortest days in Arlington?

December has the shortest days of the year in Arlington, with an average of 8.4h of daylight.

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

The average length of the day in December is 8.4h.

What is the month with the least sunshine in Arlington?

The month with the least sunshine in Arlington, Washington, is December, with an average of 4.1h of sunshine.

How many hours of sunshine does Arlington have in December?

In Arlington, the average sunshine in December is 4.1h.

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

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

How high is the UV index in December in Arlington?

In Arlington, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health threat from the exposure to the Sun's UV rays.

Average temperature in December
Arlington, WA

Average temperature in December - Arlington, WA
  • Average high temperature in December: 41.7°F

The warmest month (with the highest average high temperature) is August (72.3°F).
The month with the lowest average high temperature is December (41.7°F).

  • Average low temperature in December: 34°F

The month with the highest average low temperature is August (51.6°F).
The coldest month (with the lowest average low temperature) is February (33.8°F).

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Average pressure in December
Arlington, WA

Average pressure in December - Arlington, WA
  • Average pressure in December: 30.08"

The month with the highest atmospheric pressure is January (30.09").
The month with the lowest atmospheric pressure is August (30").

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Average wind speed in December
Arlington, WA

Average wind speed in December - Arlington, WA
  • Average wind speed in December: 5.3mph

The windiest months (with the highest average wind speed) are January and November (5.6mph).
The calmest month (with the lowest average wind speed) is August (3.3mph).

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Average humidity in December
Arlington, WA

Average humidity in December - Arlington, WA
  • Average humidity in December: 85%

Months with the highest relative humidity are January, February, November and December (85%).
The month with the lowest relative humidity is July (73%).

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Average rainfall in December
Arlington, WA

Average rainfall in December - Arlington, WA
  • Average rainfall in December: 4.53"

The wettest month (with the highest rainfall) is November (4.92").
The driest month (with the least rainfall) is July (0.51").

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Average rainfall days in December
Arlington, WA

Average rainfall days in December - Arlington, WA
  • Average rainfall days in December: 19.4 days

The month with the highest number of rainy days is March (20.9 days).
The month with the least rainy days is August (6.9 days).

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Average snowfall in December
Arlington, WA

Average snowfall in December - Arlington, WA
  • Average snowfall in December: 0.67"

The month with the highest snowfall is February (4.45").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Arlington, WA

Average snowfall days in December - Arlington, WA
  • Average snowfall days in December: 2 days

The month with the highest number of snowfall days is February (4.3 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
Arlington, WA

Average daylight in December / Average sunshine in December - Arlington, WA
  • Average daylight in December: 8.4h

The month with the longest days is June (Average daylight: 16h).
The month with the shortest days is December (Average daylight: 8.4h).

  • Average sunshine in December: 4.1h

The month with the most sunshine is August (Average sunshine: 10.7h).
The month with the least sunshine is December (Average sunshine: 4.1h).

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Average sunshine days in December
Arlington, WA

Average sunshine days in December - Arlington, WA
  • Average sunshine days in December: 9.5 days

The month with the most sunshine days is August (22 days).
The month with the least sunshine days is March (8.1 days).

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Average UV index in December
Arlington, WA

Average UV index in December - Arlington, WA
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 5).
Months with the lowest UV index are January, February, October, November and December (UV index 2).

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Average cloud cover in December
Arlington, WA

Average cloud cover in December - Arlington, WA
  • Average cloud cover in December: 57

The month with the most cloud cover is December (Cloud cover 57).
Months with the least cloud cover are July and August (Cloud cover 26).

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Average visibility in December
Arlington, WA

Average visibility in December - Arlington, WA
  • Average visibility in December: 5mi

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

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