December weather forecast
Coos Bay, OR

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A unique sandy and rocky shore near a forest of pine trees in the Shore Acres State Park in Coos Bay, Oregon
A unique sandy and rocky shore near a forest of pine trees in the Shore Acres State Park in Coos Bay, Oregon

Weather in December

Finally, December rolls in, marking the advent of winter in Coos Bay. Seeing the highest rainfall of the year at 5.87" (149mm), the city is frequently under cloudy skies. Notably, the wind, bearing a cold snap, reaches its strongest speed in this month. With the shortest days and lack of sunshine, December presents a profound change in the weather. As the year concludes, Coos Bay, Oregon, braces itself for the chill of winter.

Temperature

The coldest period in Coos Bay, Oregon, tends to be December, when average temperatures fluctuate between a high of 49.1°F (9.5°C) and a low of 41.7°F (5.4°C).

Humidity

In Coos Bay, the average relative humidity in December is 82%.

Rainfall

The month with the most rainfall is December, when the rain falls for 18.6 days and typically aggregates up to 5.87" (149mm) of precipitation.

Snowfall

March through October and December are months without snowfall in Coos Bay.

Daylight

With an average of 9h and 0min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:30 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 4:51 pm PST.

Sunshine

In December, the average sunshine in Coos Bay is 4.5h.

UV index

February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: In December, the maximum UV index of 2 suggests these recommendations:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. Direct Sun exposure should be minimized especially during midday when radiation is most intense. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Updated: Feb 13, 2024 | Published by: Weather Atlas | About Us / Weather Forecasting / Data Sources

Frequently asked questions

What are the coldest months in Coos Bay?

Coos Bay, Oregon, experiences its average lowest temperatures in December, reaching a peak of 49.1°F (9.5°C) and a minimum of 41.7°F (5.4°C).

What are the temperatures in Coos Bay in December?

In Coos Bay, in December, the average high-temperature is 49.1°F (9.5°C), and the average low-temperature is 41.7°F (5.4°C).

What is the average humidity in December in Coos Bay?

The average relative humidity in December is 82%.

What is the wettest month in Coos Bay?

The month with the most rainfall is December, when the rain falls for 18.6 days and typically aggregates up to 5.87" (149mm) of precipitation.

How many days does it rain in December in Coos Bay?

In Coos Bay, Oregon, during December, the rain falls for 18.6 days and regularly aggregates up to 5.87" (149mm) of precipitation.

When it does not snow in Coos Bay?

In Coos Bay, Oregon, snow does not fall in March through October and December.

Does it snow in Coos Bay in December?

In December, in Coos Bay, it doesn't snow. November is the latest month when it typically snows.

What is the month with the shortest days in Coos Bay?

The month with the shortest days is December, with an average of 9h and 0min of daylight.

How many hours of daylight does Coos Bay have in December?

In Coos Bay, the average day length in December is 9h and 2min.

What time are sunrise and sunset in December in Coos Bay?

On the first day of December, sunrise is at 7:30 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 4:51 pm PST.

How many hours of sunshine does Coos Bay have in December?

In Coos Bay, Oregon, the average sunshine duration in December is 4.5h.

When is the lowest UV index in Coos Bay?

February and December, with an average maximum UV index of 2, are months with the lowest UV index in Coos Bay.

How high is the UV index in December in Coos Bay?

The average daily maximum UV index in December in Coos Bay, Oregon, is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Coos Bay, OR

Average temperature in December - Coos Bay, OR
  • Average high temperature in December: 49.1°F

The warmest month (with the highest average high temperature) is August (66.9°F).
The month with the lowest average high temperature is December (49.1°F).

  • Average low temperature in December: 41.7°F

The month with the highest average low temperature is August (52.3°F).
The coldest months (with the lowest average low temperature) are February and December (41.7°F).

Average pressure in December
Coos Bay, OR

Average pressure in December - Coos Bay, OR
  • Average pressure in December: 30.08"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is September (30.01"Hg).

Average wind speed in December
Coos Bay, OR

Average wind speed in December - Coos Bay, OR
  • Average wind speed in December: 8.8mph

The windiest month (with the highest average wind speed) is March (9.1mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).

Average humidity in December
Coos Bay, OR

Average humidity in December - Coos Bay, OR
  • Average humidity in December: 82%

The months with the highest relative humidity are February and August (84%).
The months with the lowest relative humidity are April and October (81%).

Average rainfall in December
Coos Bay, OR

Average rainfall in December - Coos Bay, OR
  • Average rainfall in December: 5.87"

The wettest month (with the highest rainfall) is December (5.87").
The driest month (with the least rainfall) is July (0.16").

Average rainfall days in December
Coos Bay, OR

Average rainfall days in December - Coos Bay, OR
  • Average rainfall days in December: 18.6 days

The month with the highest number of rainy days is March (19.2 days).
The month with the least rainy days is August (3.5 days).

Average snowfall in December
Coos Bay, OR

Average snowfall in December - Coos Bay, OR
  • Average snowfall in December: 0"

The month with the highest snowfall is February (0.2").
The months with the least snowfall are March, April, May, June, July, August, September, October and December (0").

Average snowfall days in December
Coos Bay, OR

Average snowfall days in December - Coos Bay, OR
  • Average snowfall days in December: 0.1 days

The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Coos Bay, OR

Average daylight in December / Average sunshine in December - Coos Bay, OR
  • Average daylight in December: 9h and 0min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in December: 4h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The months with the least sunshine are January and February (Average sunshine: 4h and 24min).

Average sunshine days in December
Coos Bay, OR

Average sunshine days in December - Coos Bay, OR
  • Average sunshine days in December: 10.8 days

The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is February (9.7 days).

Average UV index in December
Coos Bay, OR

Average UV index in December - Coos Bay, OR
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are February and December (UV index 2).

Average cloud cover in December
Coos Bay, OR

Average cloud cover in December - Coos Bay, OR
  • Average cloud cover in December: 53

The month with the most cloud cover is February (Cloud cover 56).
The months with the least cloud cover are July and September (Cloud cover 28).

Average visibility in December
Coos Bay, OR

Average visibility in December - Coos Bay, OR
  • Average visibility in December: 6mi

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

Coos Bay, Oregon, USA

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