December weather forecast
Oregon City, OR

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Weather in December

The weather in Oregon City in December is characterized by winter's full arrival, marked by shorter days and longer, colder nights. Light snowfall blankets the city, adding to the charm of the holiday season. A unique detail about this month is the return of snowfall, albeit light, accumulating to approximately 0.51" (13mm) over a span of 0.9 days. The combination of minimal daylight, colder temperatures and increased cloud cover gives December its frosty character. By the end of the month, a white winter has firmly set in across the city, painting an idyllic winter scene.

Temperature

December, with an average high of 44.4°F (6.9°C) and a low of 34.3°F (1.3°C), signifies the coldest month of the year.

Humidity

The average relative humidity in December in Oregon City is 83%.

Rainfall

December is the month with the most rainfall in Oregon City. Rain falls for 19.2 days and accumulates 5.16" (131mm) of precipitation.

Snowfall

Months with snowfall are January through March, November and December. In Oregon City, Oregon, in December, snow falls for 0.9 days, with typically accumulated 0.51" (13mm) of snow. Throughout the year, in Oregon City, Oregon, there are 6.1 snowfall days, and 4.17" (106mm) of snow is accumulated.

Daylight

With an average of 8h and 48min of daylight, December has the shortest days of the year in Oregon City.
On the first day of December in Oregon City, Oregon, sunrise is at 7:30 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 4:37 pm PST.

Sunshine

In Oregon City, the average sunshine in December is 4.4h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Oregon City. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: A maximum UV index of 2 in December translates into the following recommendations:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
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Frequently asked questions

What is the coldest time of year in Oregon City?

December, on average, is the coldest month in Oregon City, Oregon, registering a high temperature of 44.4°F (6.9°C) and a low of 34.3°F (1.3°C).

Is it cold in Oregon City during December?

An average high-temperature, in December, in Oregon City, is 44.4°F (6.9°C) and the average low-temperature is 34.3°F (1.3°C). In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 84.2°F (29°C).

What is the average humidity in December in Oregon City?

The average relative humidity in December in Oregon City, Oregon, is 83%.

What is the wettest month in Oregon City?

The month with the most rainfall is December, when the rain falls for 19.2 days and typically aggregates up to 5.16" (131mm) of precipitation.

How much does it rain in Oregon City in December?

In Oregon City, Oregon, in December, during 19.2 rainfall days, 5.16" (131mm) of precipitation is typically accumulated.

How many days does it snow in December in Oregon City?

In Oregon City, in December, during 0.9 snowfall days, 0.51" (13mm) of snow is typically accumulated.

What is the month with the shortest days in Oregon City?

The month with the shortest days in Oregon City, Oregon, is December, with an average of 8h and 48min of daylight.

How many hours of daylight does Oregon City have in December?

In Oregon City, Oregon, the average day length in December is 8h and 47min.

When is the sunrise / sunset in December in Oregon City?

On the first day of December in Oregon City, sunrise is at 7:30 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 4:37 pm PST.

How many hours of sunshine does Oregon City have in December?

The average sunshine duration in December is 4.4h.

What is the month with the lowest UV index in Oregon City?

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

How high is the UV index in December in Oregon City?

In Oregon City, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from unsafe exposure to Sun's UV rays.
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
Oregon City, OR

Average temperature in December - Oregon City, OR
  • Average high temperature in December: 44.4°F

The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (44.4°F).

  • Average low temperature in December: 34.3°F

The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (34.3°F).

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Average pressure in December
Oregon City, OR

Average pressure in December - Oregon City, OR
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).

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Average wind speed in December
Oregon City, OR

Average wind speed in December - Oregon City, OR
  • Average wind speed in December: 5.7mph

The windiest month (with the highest average wind speed) is January (6mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).

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Average humidity in December
Oregon City, OR

Average humidity in December - Oregon City, OR
  • Average humidity in December: 83%

The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is August (64%).

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Average rainfall in December
Oregon City, OR

Average rainfall in December - Oregon City, OR
  • Average rainfall in December: 5.16"

The wettest month (with the highest rainfall) is December (5.16").
The driest month (with the least rainfall) is July (0.24").

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Average rainfall days in December
Oregon City, OR

Average rainfall days in December - Oregon City, OR
  • Average rainfall days in December: 19.2 days

The month with the highest number of rainy days is March (20.3 days).
The month with the least rainy days is August (4 days).

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Average snowfall in December
Oregon City, OR

Average snowfall in December - Oregon City, OR
  • Average snowfall in December: 0.51"

The month with the highest snowfall is February (1.5").
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
Oregon City, OR

Average snowfall days in December - Oregon City, OR
  • Average snowfall days in December: 0.9 days

The month with the highest number of snowfall days is February (2.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Oregon City, OR

Average daylight in December / Average sunshine in December - Oregon City, OR
  • Average daylight in December: 8h and 5min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in December: 4h and 2min

The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).

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Average sunshine days in December
Oregon City, OR

Average sunshine days in December - Oregon City, OR
  • Average sunshine days in December: 10.5 days

The month with the most sunshine days is July (26.2 days).
The month with the least sunshine days is February (8.1 days).

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Average UV index in December
Oregon City, OR

Average UV index in December - Oregon City, OR
  • 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
Oregon City, OR

Average cloud cover in December - Oregon City, OR
  • Average cloud cover in December: 54

The month with the most cloud cover is February (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 22).

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Average visibility in December
Oregon City, OR

Average visibility in December - Oregon City, OR
  • Average visibility in December: 5mi

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

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Oregon City, Oregon, USA

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