December weather forecast
Oroville, WA

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Weather in December

The first month of the winter, December, is still a freezing cold month in Oroville, Washington, with an average temperature ranging between min 13.1°F (-10.5°C) and max 27°F (-2.8°C).

Temperature

December, marked by an average high-temperature of 27°F (-2.8°C) and a low-temperature of 13.1°F (-10.5°C), is the coldest month.

Humidity

In Oroville, the average relative humidity in December is 92%.

Rainfall

In Oroville, Washington, in December, during 5.7 rainfall days, 1.34" (34mm) of precipitation is typically accumulated. Throughout the year, in Oroville, there are 112.2 rainfall days, and 14.69" (373mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Oroville are January through May, September through December. The month with the most snowfall in Oroville is December, when snow falls for 17.3 days and typically aggregates up to 9.76" (248mm) of snow.

Daylight

With an average of 8h and 18min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:31 am and sunset at 4:03 pm. On the last day of December, in Oroville, sunrise is at 7:51 am and sunset at 4:10 pm PST.

Sunshine

In December, the average sunshine is 4.3h.

UV index

January, February, November and December, with an average maximum UV index of 1, 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 radiation for the average person.
Note: In December, the maximum UV index of 1 transforms into these recommendations:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
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Frequently asked questions

What part of the year is the coldest in Oroville?

Oroville records the coldest temperatures in December, averaging a high of 27°F (-2.8°C) and a low of 13.1°F (-10.5°C).

How cold is it in Oroville in December?

In Oroville, in December, the average high-temperature is 27°F (-2.8°C), and the average low-temperature is 13.1°F (-10.5°C).

What is the average humidity in December in Oroville?

In December, the average relative humidity is 92%.

How many days does it rain in December in Oroville?

In Oroville, in December, during 5.7 rainfall days, 1.34" (34mm) of precipitation is typically accumulated.

What is the snowiest month in Oroville?

The month with the most snowfall in Oroville, Washington, is December, when snow falls for 17.3 days and typically aggregates up to 9.76" (248mm) of snow.

How many days does it snow in December in Oroville?

In December, in Oroville, Washington, it is snowing for 17.3 days. Throughout December, 9.76" (248mm) of snow is accumulated.

What is the month with the shortest days in Oroville?

With an average of 8h and 18min of daylight, December has the shortest days of the year.

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

In December, the average day length in Oroville is 8h and 19min.

When is the sunrise / sunset in December in Oroville?

On the first day of December in Oroville, Washington, sunrise is at 7:31 am and sunset at 4:03 pm. On the last day of the month, sunrise is at 7:51 am and sunset at 4:10 pm PST.

How many hours of sunshine does Oroville have in December?

In December, the average sunshine duration in Oroville, Washington, is 4.3h.

What are the months with the lowest UV index in Oroville?

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index.

How high is the UV index in December in Oroville?

The average daily maximum UV index in December in Oroville is 1. 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
Oroville, WA

Average temperature in December - Oroville, WA
  • Average high temperature in December: 27°F

The warmest month (with the highest average high temperature) is August (79.2°F).
The month with the lowest average high temperature is December (27°F).

  • Average low temperature in December: 13.1°F

The month with the highest average low temperature is August (49.5°F).
The coldest month (with the lowest average low temperature) is December (13.1°F).

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Average pressure in December
Oroville, WA

Average pressure in December - Oroville, WA
  • Average pressure in December: 30.16"Hg

The month with the highest atmospheric pressure is January (30.18"Hg).
The months with the lowest atmospheric pressure are June and August (29.93"Hg).

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Average wind speed in December
Oroville, WA

Average wind speed in December - Oroville, WA
  • Average wind speed in December: 3.7mph

The windiest month (with the highest average wind speed) is April (4.5mph).
The calmest months (with the lowest average wind speed) are January, February and December (3.7mph).

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Average humidity in December
Oroville, WA

Average humidity in December - Oroville, WA
  • Average humidity in December: 92%

The month with the highest relative humidity is January (94%).
The month with the lowest relative humidity is August (49%).

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Average rainfall in December
Oroville, WA

Average rainfall in December - Oroville, WA
  • Average rainfall in December: 1.34"

The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is August (0.47").

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Average rainfall days in December
Oroville, WA

Average rainfall days in December - Oroville, WA
  • Average rainfall days in December: 5.7 days

The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is December (5.7 days).

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Average snowfall in December
Oroville, WA

Average snowfall in December - Oroville, WA
  • Average snowfall in December: 9.76"

The month with the highest snowfall is December (9.76").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in December
Oroville, WA

Average snowfall days in December - Oroville, WA
  • Average snowfall days in December: 17.3 days

The month with the highest number of snowfall days is January (18.3 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in December /
Average sunshine in December
Oroville, WA

Average daylight in December / Average sunshine in December - Oroville, WA
  • Average daylight in December: 8h and 2min

The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).

  • Average sunshine in December: 4h and 2min

The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).

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Average sunshine days in December
Oroville, WA

Average sunshine days in December - Oroville, WA
  • Average sunshine days in December: 13.7 days

The month with the most sunshine days is August (22.4 days).
The month with the least sunshine days is March (10.8 days).

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Average UV index in December
Oroville, WA

Average UV index in December - Oroville, WA
  • Average UV index in December: 1

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 1).

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Average cloud cover in December
Oroville, WA

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

The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 14).

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Average visibility in December
Oroville, WA

Average visibility in December - Oroville, WA
  • Average visibility in December: 3mi

The months with the highest visibility are April, May, June, July, August and September (6mi).
The month with the lowest visibility is January (2mi).

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Oroville, Washington, USA

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