December weather forecast
Maple Valley, WA

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Weather in December

December, the first month of the winter in Maple Valley, is also an icy month, with an average temperature ranging between max 40.8°F (4.9°C) and min 32°F (0°C).

Temperature

December stands out as Maple Valley's coldest month, with an average high-temperature of 40.8°F (4.9°C) and a low-temperature of 32°F (0°C).

Humidity

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

Rainfall

The month with the most rainfall is December, when the rain falls for 18.7 days and typically aggregates up to 5.43" (138mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In Maple Valley, in December, during 3.9 snowfall days, 1.65" (42mm) of snow is typically accumulated. Throughout the year, in Maple Valley, Washington, there are 19.7 snowfall days, and 11.5" (292mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 8h and 30min of daylight.
On the first day of December, sunrise is at 7:35 am and sunset at 4:19 pm. On the last day of the month, sunrise is at 7:55 am and sunset at 4:27 pm PST.

Sunshine

January and December, with an average of 4.1h of sunshine, are months with the least sunshine in Maple Valley.

UV index

In Maple Valley, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
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Frequently asked questions

What part of the year is the coldest in Maple Valley?

Maple Valley's coldest month, December, registers temperatures that range from a high of 40.8°F (4.9°C) to a low of 32°F (0°C).

How cold does it get in Maple Valley in December?

The high-temperature in Maple Valley during December is 40.8°F (4.9°C) and the low-temperature is 32°F (0°C).

What is the average humidity in December in Maple Valley?

The average relative humidity in December in Maple Valley, Washington, is 85%.

What is the rainiest month in Maple Valley?

December is the month with the most rainfall in Maple Valley. Rain falls for 18.7 days and accumulates 5.43" (138mm) of precipitation.

How many days does it rain in December in Maple Valley?

In Maple Valley, Washington, in December, during 18.7 rainfall days, 5.43" (138mm) of precipitation is typically accumulated.

How many days does it snow in December in Maple Valley?

In Maple Valley, in December, snow falls for 3.9 days, with typically accumulated 1.65" (42mm) of snow.

What is the month with the shortest days in Maple Valley?

December has the shortest days of the year, with an average of 8h and 30min of daylight.

How many hours of daylight does Maple Valley have in December?

In Maple Valley, the average day length in December is 8h and 32min.

When is the sunrise / sunset in December in Maple Valley?

On the first day of December in Maple Valley, sunrise is at 7:35 am and sunset at 4:19 pm. On the last day of the month, sunrise is at 7:55 am and sunset at 4:27 pm PST.

What are the months with the least sunshine in Maple Valley?

The months with the least sunshine are January and December, with an average of 4.1h of sunshine.

How long on average sun shines in December in Maple Valley?

In December, the average sunshine duration in Maple Valley is 4.1h.

How high is the UV index in December in Maple Valley?

In Maple Valley, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health risk 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
Maple Valley, WA

Average temperature in December - Maple Valley, WA
  • Average high temperature in December: 40.8°F

The warmest month (with the highest average high temperature) is August (75.4°F).
The month with the lowest average high temperature is December (40.8°F).

  • Average low temperature in December: 32°F

The month with the highest average low temperature is August (50.2°F).
The coldest month (with the lowest average low temperature) is February (31.6°F).

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Average pressure in December
Maple Valley, WA

Average pressure in December - Maple Valley, WA
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30"Hg).

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Average wind speed in December
Maple Valley, WA

Average wind speed in December - Maple Valley, WA
  • Average wind speed in December: 4.8mph

The windiest month (with the highest average wind speed) is January (5.2mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).

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Average humidity in December
Maple Valley, WA

Average humidity in December - Maple Valley, WA
  • Average humidity in December: 85%

The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is July (70%).

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Average rainfall in December
Maple Valley, WA

Average rainfall in December - Maple Valley, WA
  • Average rainfall in December: 5.43"

The wettest month (with the highest rainfall) is December (5.43").
The driest month (with the least rainfall) is July (0.59").

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Average rainfall days in December
Maple Valley, WA

Average rainfall days in December - Maple Valley, WA
  • Average rainfall days in December: 18.7 days

The month with the highest number of rainy days is March (20.5 days).
The month with the least rainy days is August (6.7 days).

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Average snowfall in December
Maple Valley, WA

Average snowfall in December - Maple Valley, WA
  • Average snowfall in December: 1.65"

The month with the highest snowfall is February (4.17").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Maple Valley, WA

Average snowfall days in December - Maple Valley, WA
  • Average snowfall days in December: 3.9 days

The month with the highest number of snowfall days is February (6 days).
The months with the least snowfall days are June, July, August and October (0 days).

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Average daylight in December /
Average sunshine in December
Maple Valley, WA

Average daylight in December / Average sunshine in December - Maple Valley, WA
  • Average daylight in December: 8h and 3min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in December: 4h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 4h and 6min).

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Average sunshine days in December
Maple Valley, WA

Average sunshine days in December - Maple Valley, WA
  • Average sunshine days in December: 10.3 days

The month with the most sunshine days is August (22 days).
The month with the least sunshine days is February (8.4 days).

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Average UV index in December
Maple Valley, WA

Average UV index in December - Maple Valley, WA
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is November (UV index 1).

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Average cloud cover in December
Maple Valley, WA

Average cloud cover in December - Maple Valley, WA
  • Average cloud cover in December: 57

The months with the most cloud cover are January, February, March and December (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in December
Maple Valley, WA

Average visibility in December - Maple Valley, WA
  • Average visibility in December: 4mi

The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January, February and December (4mi).

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Maple Valley, Washington, USA

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