December weather forecast
Bellevue, WA

The scenic lakeside city of Bellevue, Washington
The scenic lakeside city of Bellevue, Washington

Weather in December

The first month of the winter, December, is still a chilly month in Bellevue, Washington, with an average temperature varying between 42.8°F (6°C) and 34.7°F (1.5°C).

Temperature

The coldest month is December, with an average high-temperature of 42.8°F (6°C) and an average low-temperature of 34.7°F (1.5°C).

Humidity

In December, the average relative humidity in Bellevue, Washington, is 84%.

Rainfall

December is the month with the most rainfall in Bellevue, Washington. Rain falls for 12.5 days and accumulates 2.01" (51mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall in Bellevue. In December, it is snowing for 1.1 days. Throughout December, 0.31" (8mm) of snow is accumulated. Throughout the year, in Bellevue, there are 7 snowfall days, and 3.27" (83mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 8h and 31min of daylight.
On the first day of the month, sunrise is at 7:36 am and sunset at 4:19 pm. On the last day of December, in Bellevue, Washington, sunrise is at 7:56 am and sunset at 4:26 pm PST.

Sunshine

With an average of 4.2h of sunshine, December has the least sunshine of the year in Bellevue.

UV index

The months with the lowest UV index in Bellevue are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.
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 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 the 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Bellevue?

The coldest month is December, with an average high-temperature of 42.8°F (6°C) and an average low-temperature of 34.7°F (1.5°C).

What is the temperature in December in Bellevue?

The average high-temperature, in December, in Bellevue, Washington, is 42.8°F (6°C), while the average low-temperature is 34.7°F (1.5°C).

What is the average humidity in December in Bellevue?

The average relative humidity in December is 84%.

What is the rainiest month in Bellevue?

December is the month with the most rainfall in Bellevue. Rain falls for 12.5 days and accumulates 2.01" (51mm) of precipitation.

How many days does it rain in December in Bellevue?

In Bellevue, in December, during 12.5 rainfall days, 2.01" (51mm) of precipitation is typically accumulated.

How much does it snow in Bellevue in December?

In Bellevue, in December, snow falls for 1.1 days, with typically accumulated 0.31" (8mm) of snow.

What is the month with the shortest days in Bellevue?

December has the shortest days of the year in Bellevue, with an average of 8h and 31min of daylight.

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

In December, the average day length is 8h and 31min.

When are sunrise and sunset in December in Bellevue?

On the first day of December in Bellevue, sunrise is at 7:36 am and sunset at 4:19 pm. On the last day of the month, sunrise is at 7:56 am and sunset at 4:26 pm PST.

What is the month with the least sunshine in Bellevue?

With an average of 4.2h of sunshine, December has the least sunshine of the year.

How many hours of sunshine does Bellevue have in December?

The average sunshine duration in December in Bellevue is 4.2h.

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

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

What is the UV index intensity in December in Bellevue?

In December, the average daily maximum UV index in Bellevue, Washington, is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability 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
Bellevue, WA

Average temperature in December - Bellevue, WA
  • Average high temperature in December: 42.8°F

The warmest month (with the highest average high temperature) is August (76.6°F).
The month with the lowest average high temperature is December (42.8°F).

  • Average low temperature in December: 34.7°F

The month with the highest average low temperature is August (53.4°F).
The coldest month (with the lowest average low temperature) is February (34.5°F).

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Average pressure in December
Bellevue, WA

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

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).

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Average wind speed in December
Bellevue, WA

Average wind speed in December - Bellevue, WA
  • Average wind speed in December: 4.7mph

The windiest month (with the highest average wind speed) is March (5.1mph).
The calmest month (with the lowest average wind speed) is August (3.4mph).

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Average humidity in December
Bellevue, WA

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

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (69%).

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Average rainfall in December
Bellevue, WA

Average rainfall in December - Bellevue, WA
  • Average rainfall in December: 2.01"

The wettest month (with the highest rainfall) is December (2.01").
The driest month (with the least rainfall) is July (0.24").

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Average rainfall days in December
Bellevue, WA

Average rainfall days in December - Bellevue, WA
  • Average rainfall days in December: 12.5 days

The month with the highest number of rainy days is March (13.7 days).
The month with the least rainy days is August (4.1 days).

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Average snowfall in December
Bellevue, WA

Average snowfall in December - Bellevue, WA
  • Average snowfall in December: 0.31"

The month with the highest snowfall is February (1.77").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Bellevue, WA

Average snowfall days in December - Bellevue, WA
  • Average snowfall days in December: 1.1 days

The month with the highest number of snowfall days is February (3 days).
The 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
Bellevue, WA

Average daylight in December / Average sunshine in December - Bellevue, WA
  • Average daylight in December: 8h and 31min

The month with the longest days is June (Average daylight: 15h and 55min).
The month with the shortest days is December (Average daylight: 8h and 31min).

  • Average sunshine in December: 4h and 12min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).

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Average sunshine days in December
Bellevue, WA

Average sunshine days in December - Bellevue, WA
  • Average sunshine days in December: 17.4 days

The month with the most sunshine days is August (24.9 days).
The month with the least sunshine days is February (13.8 days).

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Average UV index in December
Bellevue, WA

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

The month with the highest UV index is July (UV index 6).
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
Bellevue, WA

Average cloud cover in December - Bellevue, WA
  • Average cloud cover in December: 56

The month with the most cloud cover is December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).

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Average visibility in December
Bellevue, WA

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

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

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