December weather forecast and climate
Mukilteo, WA

White buildings in neat, green fields near the iconic Mukilteo Lighthouse, Washington
White buildings in neat, green fields near the iconic Mukilteo Lighthouse, Washington

Weather in December

The first month of the winter, December, is still a cold month in Mukilteo, Washington, with average temperature ranging between min 35.4°F (1.9°C) and max 42.6°F (5.9°C).

Temperature

December is the coldest month, with an average high-temperature of 42.6°F (5.9°C) and an average low-temperature of 35.4°F (1.9°C).

Humidity

February and December, with an average relative humidity of 84%, are most humid months.

Rainfall

December is the month with the most rainfall in Mukilteo. Rain falls for 18.1 days and accumulates 3.54" (90mm) of precipitation.

Snowfall

Months with snowfall in Mukilteo are January through April, November and December. In December, in Mukilteo, it is snowing for 3.2 days. Throughout December, 1.18" (30mm) of snow is accumulated. In Mukilteo, Washington, during the entire year, snow falls for 16.3 days, and aggregates up to 10.08" (256mm) of snow.

Ocean temperature

In Mukilteo, the average water temperature is 46.6°F (8.1°C).
Note: Swimming in 46.6°F (8.1°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

With an average of 8.5h of daylight, December has the shortest days of the year in Mukilteo, Washington.

Sunshine

The average sunshine in December is 4.5h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Mukilteo. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to the UV radiation for the average 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. 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 Mukilteo?

With an average high-temperature of 42.6°F (5.9°C) and an average low-temperature of 35.4°F (1.9°C), December is the coldest month.

What is the most humid month in Mukilteo?

Months with the highest humidity are February and December, with an average relative humidity of 84%.

What is the average humidity in December in Mukilteo?

The average relative humidity in December in Mukilteo is 84%.

What is the wettest month in Mukilteo?

The month with the most rainfall in Mukilteo is December when the rain falls for 18.1 days and typically aggregates up to 3.54" (90mm) of precipitation.

How much does it rain in Mukilteo in December?

In December, the rain falls for 18.1 days. Throughout December, 3.54" (90mm) of precipitation is accumulated.

How much does it snow in Mukilteo in December?

In Mukilteo, during December, snow falls for 3.2 days and regularly aggregates up to 1.18" (30mm) of snow.

How cold is the water in December in Mukilteo?

In Mukilteo, Washington, in December, the average water temperature is 46.6°F (8.1°C). Swimming in 46.6°F (8.1°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the month with the shortest days in Mukilteo?

The month with the shortest days in Mukilteo is December, with an average of 8.5h of daylight.

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

The average length of the day in December in Mukilteo, Washington, is 8.5h.

How many hours of sunshine does Mukilteo have in December?

In December, the average sunshine is 4.5h.

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

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

How high is the UV index in December in Mukilteo?

In December, the average daily maximum UV index in Mukilteo, Washington, is 2. A UV Index value of 2, and less, symbolizes a low health threat from unprotected exposure to the UV radiation.

Average temperature in December
Mukilteo, WA

Average temperature in December - Mukilteo, WA
  • Average high temperature in December: 42.6°F

The warmest month (with the highest average high temperature) is August (72.7°F).
The month with the lowest average high temperature is December (42.6°F).

  • Average low temperature in December: 35.4°F

The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (35.4°F).

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Average pressure in December
Mukilteo, WA

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

The month with the highest atmospheric pressure is January (30.09").
Months with the lowest atmospheric pressure are March, August and September (30.01").

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Average wind speed in December
Mukilteo, WA

Average wind speed in December - Mukilteo, WA
  • Average wind speed in December: 5.7mph

The windiest month (with the highest average wind speed) is November (6.2mph).
The calmest month (with the lowest average wind speed) is August (3.6mph).

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Average humidity in December
Mukilteo, WA

Average humidity in December - Mukilteo, WA
  • Average humidity in December: 84%

Months with the highest relative humidity are February and December (84%).
The month with the lowest relative humidity is July (72%).

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Average rainfall in December
Mukilteo, WA

Average rainfall in December - Mukilteo, WA
  • Average rainfall in December: 3.54"

The wettest month (with the highest rainfall) is December (3.54").
The driest month (with the least rainfall) is July (0.43").

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Average rainfall days in December
Mukilteo, WA

Average rainfall days in December - Mukilteo, WA
  • Average rainfall days in December: 18.1 days

The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (6.3 days).

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Average snowfall in December
Mukilteo, WA

Average snowfall in December - Mukilteo, WA
  • Average snowfall in December: 1.18"

The month with the highest snowfall is February (4.61").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Mukilteo, WA

Average snowfall days in December - Mukilteo, WA
  • Average snowfall days in December: 3.2 days

The month with the highest number of snowfall days is February (5.2 days).
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
Mukilteo, WA

Average sea temperature in December - Mukilteo, WA
  • Average sea temperature in December: 46.6°F

The best month for swimming (with the highest average sea temperature) is August (53.5°F).
The coldest month (with the lowest average sea temperature) is February (45.3°F).

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

Average daylight in December / Average sunshine in December - Mukilteo, WA
  • Average daylight in December: 8.5h

The month with the longest days is June (Average daylight: 16h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in December: 4.5h

The month with the most sunshine is August (Average sunshine: 10.7h).
The month with the least sunshine is January (Average sunshine: 4.4h).

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Average sunshine days in December
Mukilteo, WA

Average sunshine days in December - Mukilteo, WA
  • Average sunshine days in December: 10.7 days

The month with the most sunshine days is August (22.6 days).
The month with the least sunshine days is November (9.1 days).

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Average UV index in December
Mukilteo, WA

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

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Average cloud cover in December
Mukilteo, WA

Average cloud cover in December - Mukilteo, WA
  • Average cloud cover in December: 54

The month with the most cloud cover is December (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 25).

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Average visibility in December
Mukilteo, WA

Average visibility in December - Mukilteo, WA
  • Average visibility in December: 6mi

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

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