December weather forecast
Langley, WA

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Weather in December

December, the first month of the winter in Langley, is also an icy month, with an average temperature fluctuating between 42.3°F (5.7°C) and 34.7°F (1.5°C).

Temperature

December stands out as Langley's coldest month, with temperatures ranging between an average high of 42.3°F (5.7°C) and a low of 34.7°F (1.5°C).

Humidity

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

Rainfall

In Langley, Washington, in December, it is raining for 19.3 days, with typically 3.82" (97mm) of accumulated precipitation. Throughout the year, there are 179.1 rainfall days, and 29.57" (751mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall in Langley. In Langley, in December, during 1.5 snowfall days, 0.51" (13mm) of snow is typically accumulated. In Langley, during the entire year, snow falls for 8.9 days and aggregates up to 6.1" (155mm) of snow.

Ocean temperature

In December, the average ocean temperature is 46°F (7.8°C).
Note: With an efficient thermal swimsuit, one can navigate 46°F (7.8°C) even if it's colder than 50°F (10°C); otherwise, rapid cold shock and breathlessness might set in. Barely wading at 55.4°F (13°C) feels chilly.

Daylight

December has the shortest days of the year, with an average of 8h and 24min of daylight.
On the first day of the month, sunrise is at 7:39 am and sunset at 4:18 pm. On the last day of December, in Langley, sunrise is at 7:59 am and sunset at 4:26 pm PST.

Sunshine

The months with the least sunshine are January and December, with an average of 4.2h 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 of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for average individuals.
Note: An average maximum UV index of 2 in December leads to these recommendations:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
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Frequently asked questions

What is the coldest time of year in Langley?

December is the coldest month of the year, registering average temperatures as high as 42.3°F (5.7°C) and as low as 34.7°F (1.5°C).

How cold is December in Langley?

In December, in Langley, the average high-temperature is 42.3°F (5.7°C), and the average low-temperature is 34.7°F (1.5°C).

What are the most humid months in Langley?

The months with the highest humidity are January and December, with an average relative humidity of 85%.

What is the average humidity in December in Langley?

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

How many days does it rain in December in Langley?

In Langley, during December, the rain falls for 19.3 days and regularly aggregates up to 3.82" (97mm) of precipitation.

How much does it snow in Langley in December?

In December, in Langley, it is snowing for 1.5 days. Throughout December, 0.51" (13mm) of snow is accumulated.

How cold is the water in December in Langley?

In Langley, Washington, in December, the average water temperature is 46°F (7.8°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the month with the shortest days in Langley?

December has the shortest days of the year in Langley, Washington, with an average of 8h and 24min of daylight.

How many hours of daylight does Langley have in December?

In Langley, Washington, the average day length in December is 8h and 27min.

When is the sunrise / sunset in December in Langley?

On the first day of December, sunrise is at 7:39 am and sunset at 4:18 pm. On the last day of the month, sunrise is at 7:59 am and sunset at 4:26 pm PST.

What is the month with the least sunshine in Langley?

January and December, with an average of 4.2h of sunshine, are months with the least sunshine in Langley.

How long on average sun shines in December in Langley?

In December, the average sunshine duration in Langley, Washington, is 4.2h.

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

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

How high is the UV index in December in Langley?

In December, the average daily maximum UV index in Langley, Washington, is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health 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
Langley, WA

Average temperature in December - Langley, WA
  • Average high temperature in December: 42.3°F

The warmest month (with the highest average high temperature) is August (73°F).
The month with the lowest average high temperature is December (42.3°F).

  • Average low temperature in December: 34.7°F

The month with the highest average low temperature is August (52.5°F).
The coldest month (with the lowest average low temperature) is December (34.7°F).

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Average pressure in December
Langley, WA

Average pressure in December - Langley, WA
  • Average pressure in December: 30.08"Hg

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

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Average wind speed in December
Langley, WA

Average wind speed in December - Langley, WA
  • Average wind speed in December: 5.4mph

The windiest months (with the highest average wind speed) are March and November (5.8mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).

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Average humidity in December
Langley, WA

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

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

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Average rainfall in December
Langley, WA

Average rainfall in December - Langley, WA
  • Average rainfall in December: 3.82"

The wettest month (with the highest rainfall) is November (4.06").
The driest month (with the least rainfall) is July (0.47").

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Average rainfall days in December
Langley, WA

Average rainfall days in December - Langley, WA
  • Average rainfall days in December: 19.3 days

The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (6.1 days).

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Average snowfall in December
Langley, WA

Average snowfall in December - Langley, WA
  • Average snowfall in December: 0.51"

The month with the highest snowfall is February (2.68").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Langley, WA

Average snowfall days in December - Langley, WA
  • Average snowfall days in December: 1.5 days

The month with the highest number of snowfall days is February (3.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in December
Langley, WA

Average sea temperature in December - Langley, WA
  • Average sea temperature in December: 46°F

The best month for swimming (with the highest average sea temperature) is August (53.3°F).
The coldest months (with the lowest average sea temperature) are February and March (45.1°F).

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Average daylight in December /
Average sunshine in December
Langley, WA

Average daylight in December / Average sunshine in December - Langley, WA
  • Average daylight in December: 8h and 2min

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).

  • Average sunshine in December: 4h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are January and December (Average sunshine: 4h and 12min).

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Average sunshine days in December
Langley, WA

Average sunshine days in December - Langley, WA
  • Average sunshine days in December: 10.1 days

The month with the most sunshine days is August (23.1 days).
The months with the least sunshine days are February and November (8.6 days).

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Average UV index in December
Langley, WA

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

The months with the highest UV index are June and July (UV index 5).
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
Langley, WA

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

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

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Average visibility in December
Langley, WA

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

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

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Langley, Washington, USA

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