December weather forecast
Maple Valley, WA

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Weather in December

The first month of the winter, December, is still a cold month in Maple Valley, Washington, with temperature in the range of an average high of 40.8°F (4.9°C) and an average low of 32°F (0°C).

Temperature

In Maple Valley, the lowest temperatures are generally noted in December, averaging a high of 40.8°F (4.9°C) and a low 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

Months with snowfall are January through April, November and December. In Maple Valley, in December, snow falls for 3.9 days, with typically accumulated 1.65" (42mm) of snow. In Maple Valley, Washington, during the entire year, snow falls for 19.7 days and aggregates up to 11.5" (292mm) of snow.

Daylight

The month with the shortest days is December, 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

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

UV index

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for average individuals.
Note: The maximum UV index of 2 during December translates into these guidelines:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Updated: Jul 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the coldest?

Temperature readings reach their annual highs in December, averaging 40.8°F (4.9°C) and a minimum average of 32°F (0°C).

How cold is it in December?

Maple Valley in December has an average high-temperature of 40.8°F (4.9°C) and an average low-temperature of 32°F (0°C).

What is the average humidity in December?

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

What is the wettest month in Maple Valley?

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.

How many days does it rain in December?

In December, the rain falls for 18.7 days. Throughout December, 5.43" (138mm) of precipitation is accumulated.

How many days does it snow in December?

In Maple Valley, during December, snow falls for 3.9 days and regularly aggregates up to 1.65" (42mm) of snow.

What is the month with the shortest days?

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

What is the average length of the day in December?

The average day length in December is 8h and 32min.

What time are sunrise and sunset in December?

In December, on the first day of the month, 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?

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

How long on average sun shines in December?

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

What is the UV index reading in December?

In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from exposure to the Sun's 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).

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).

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).

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%).

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").

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).

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").

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).

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).

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).

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).

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).

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).

Maple Valley, Washington, USA

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