December weather forecast
O'Brien, OR

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Weather in December

The first month of the winter, December, is also a fresh month in O'Brien, Oregon, with temperature in the range of an average low of 40.6°F (4.8°C) and an average high of 50.4°F (10.2°C).

Temperature

O'Brien's December weather, with an average high temperature of 50.4°F (10.2°C) and an average low temperature of 40.6°F (4.8°C), tends to be the coldest of the year.

Humidity

In December, the average relative humidity is 80%.

Rainfall

In December, in O'Brien, the rain falls for 17 days. Throughout December, 7.44" (189mm) of precipitation is accumulated. In O'Brien, during the entire year, the rain falls for 131.8 days and collects up to 46.14" (1172mm) of precipitation.

Snowfall

In O'Brien, snow does not fall in January, March through December.

Daylight

With an average of 9h and 12min of daylight, December has the shortest days of the year in O'Brien, Oregon.
On the first day of the month, sunrise is at 7:24 am and sunset at 4:44 pm. On the last day of December, in O'Brien, sunrise is at 7:42 am and sunset at 4:53 pm PST.

Sunshine

With an average of 4.7h of sunshine, December has the least sunshine of the year.

UV index

The months with the lowest UV index are February and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: A typical high UV index of 2 in December suggests the following recommendations:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
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Frequently asked questions

What is the coldest month in O'Brien?

December stands out as O'Brien's coldest month, with temperatures ranging between an average high of 50.4°F (10.2°C) and a low of 40.6°F (4.8°C).

What are the temperatures in O'Brien in December?

In December, in O'Brien, the average high-temperature is 50.4°F (10.2°C), and the average low-temperature is 40.6°F (4.8°C).

What is the average humidity in December in O'Brien?

The average relative humidity in December in O'Brien, Oregon, is 80%.

How many days does it rain in December in O'Brien?

In December, in O'Brien, Oregon, the rain falls for 17 days. Throughout December, 7.44" (189mm) of precipitation is accumulated.

When it does not snow in O'Brien?

In O'Brien, snow does not fall in January, March through December.

What is the month with the shortest days in O'Brien?

With an average of 9h and 12min of daylight, December has the shortest days of the year in O'Brien.

How many hours of daylight does O'Brien have in December?

In December, the average day length is 9h and 10min.

When are sunrise and sunset in December in O'Brien?

In December, on the first day of the month, sunrise is at 7:24 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 4:53 pm PST.

What is the month with the least sunshine in O'Brien?

December has the least sunshine of the year in O'Brien, with an average of 4.7h of sunshine.

How long on average sun shines in December in O'Brien?

In O'Brien, Oregon, the average sunshine duration in December is 4.7h.

What is the month with the lowest UV index in O'Brien?

The months with the lowest UV index in O'Brien are February and December, with an average maximum UV index of 2.

What is the UV index reading in December in O'Brien?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from exposure to the Sun's 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
O'Brien, OR

Average temperature in December - O
  • Average high temperature in December: 50.4°F

The warmest month (with the highest average high temperature) is July (71.8°F).
The month with the lowest average high temperature is December (50.4°F).

  • Average low temperature in December: 40.6°F

The month with the highest average low temperature is July (53.6°F).
The coldest month (with the lowest average low temperature) is February (40.5°F).

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Average pressure in December
O'Brien, OR

Average pressure in December - O
  • 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 (29.99"Hg).

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Average wind speed in December
O'Brien, OR

Average wind speed in December - O
  • Average wind speed in December: 7.8mph

The windiest month (with the highest average wind speed) is March (8.2mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

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Average humidity in December
O'Brien, OR

Average humidity in December - O
  • Average humidity in December: 80%

The month with the highest relative humidity is March (83%).
The month with the lowest relative humidity is September (72%).

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Average rainfall in December
O'Brien, OR

Average rainfall in December - O
  • Average rainfall in December: 7.44"

The wettest month (with the highest rainfall) is January (8.11").
The driest month (with the least rainfall) is July (0.12").

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Average rainfall days in December
O'Brien, OR

Average rainfall days in December - O
  • Average rainfall days in December: 17 days

The month with the highest number of rainy days is March (19.2 days).
The month with the least rainy days is July (2.3 days).

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Average snowfall in December
O'Brien, OR

Average snowfall in December - O
  • Average snowfall in December: 0"

The month with the highest snowfall is February (0.59").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in December
O'Brien, OR

Average snowfall days in December - O
  • 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 January, March, April, May, June, July, August, September, October and November (0 days).

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Average daylight in December /
Average sunshine in December
O'Brien, OR

Average daylight in December / Average sunshine in December - O
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in December: 4h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 4h and 42min).

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Average sunshine days in December
O'Brien, OR

Average sunshine days in December - O
  • Average sunshine days in December: 13 days

The month with the most sunshine days is July (27.7 days).
The month with the least sunshine days is March (10.5 days).

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Average UV index in December
O'Brien, OR

Average UV index in December - O
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (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
O'Brien, OR

Average cloud cover in December - O
  • Average cloud cover in December: 47

The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 10).

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Average visibility in December
O'Brien, OR

Average visibility in December - O
  • Average visibility in December: 6mi

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

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O'Brien, Oregon, USA

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