December weather forecast
Coos Bay, OR

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

December, the first month of the winter in Coos Bay, is also a frosty month, with an average temperature ranging between max 49.1°F (9.5°C) and min 41.7°F (5.4°C).

Temperature

The coldest month is December, with an average high-temperature of 49.1°F (9.5°C) and an average low-temperature of 41.7°F (5.4°C).

Humidity

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

Rainfall

December is the month with the most rainfall in Coos Bay. Rain falls for 18.6 days and accumulates 5.87" (149mm) of precipitation.

Snowfall

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

Daylight

The month with the shortest days in Coos Bay is December, with an average of 9h and 2min of daylight.
On the first day of December, sunrise is at 7:29 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 4:50 pm PST.

Sunshine

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

UV index

The months with the lowest UV index in Coos Bay are February and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the ordinary 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 Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 Coos Bay?

The coldest month in Coos Bay is December, with an average high-temperature of 49.1°F (9.5°C) and an average low-temperature of 41.7°F (5.4°C).

What is the temperature in December in Coos Bay?

In December, in Coos Bay, 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?

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

What is the wettest month in Coos Bay?

The month with the most rainfall in Coos Bay, Oregon, 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, in December, during 18.6 rainfall days, 5.87" (149mm) of precipitation is typically accumulated.

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, Oregon, it doesn't snow. November is the latest month when it typically snows.

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

With an average of 9h and 2min of daylight, December has the shortest days of the year in Coos Bay.

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

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

When are sunrise and sunset in December in Coos Bay?

In December, on the first day of the month, sunrise is at 7:29 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 4:50 pm PST.

How long on average sun shines in December in Coos Bay?

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

What is the month with 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, Oregon.

What is the UV index intensity in December in Coos Bay?

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

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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).

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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).

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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%).

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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").

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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).

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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").

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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).

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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 2min

The month with the longest days is June (Average daylight: 15h and 21min).
The month with the shortest days is December (Average daylight: 9h and 2min).

  • Average sunshine in December: 4h and 30min

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).

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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).

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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).

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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).

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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).

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