December weather forecast
Grants Pass, OR

Colorful balloons rise from the scenic grounds in a field near Grant Pass, Oregon
Colorful balloons rise from the scenic grounds in a field near Grant Pass, Oregon

Weather in December

The first month of the winter, December, is also a frosty month in Grants Pass, Oregon, with an average temperature ranging between max 46°F (7.8°C) and min 31.5°F (-0.3°C).

Temperature

December is the coldest month, with an average high-temperature of 46°F (7.8°C) and an average low-temperature of 31.5°F (-0.3°C).

Humidity

In December, the average relative humidity is 84%.

Rainfall

The month with the most rainfall in Grants Pass, Oregon, is December, when the rain falls for 15.9 days and typically aggregates up to 4.02" (102mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. In December, in Grants Pass, it is snowing for 1.1 days. Throughout December, 0.51" (13mm) of snow is accumulated. In Grants Pass, during the entire year, snow falls for 7.9 days and aggregates up to 5.12" (130mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 8min of daylight.
On the first day of the month, sunrise is at 7:23 am and sunset at 4:41 pm. On the last day of December, sunrise is at 7:42 am and sunset at 4:50 pm PST.

Sunshine

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

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Grants Pass. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The average daily UV index of 2 in December transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Grants Pass?

With an average high-temperature of 46°F (7.8°C) and an average low-temperature of 31.5°F (-0.3°C), December is the coldest month in Grants Pass, Oregon.

What is the average humidity in December in Grants Pass?

The average relative humidity in December in Grants Pass, Oregon, is 84%.

What is the rainiest month in Grants Pass?

The month with the most rainfall in Grants Pass, Oregon, is December, when the rain falls for 15.9 days and typically aggregates up to 4.02" (102mm) of precipitation.

How much does it rain in Grants Pass in December?

In Grants Pass, Oregon, during December, the rain falls for 15.9 days and regularly aggregates up to 4.02" (102mm) of precipitation.

How many days does it snow in December in Grants Pass?

In Grants Pass, in December, snow falls for 1.1 days, with typically accumulated 0.51" (13mm) of snow.

What is the month with the shortest days in Grants Pass?

With an average of 9h and 8min of daylight, December has the shortest days of the year in Grants Pass, Oregon.

How many hours of daylight does Grants Pass have in December?

In December, the average day length in Grants Pass, Oregon, is 9h and 8min.

When is the sunrise / sunset in December in Grants Pass?

On the first day of December in Grants Pass, Oregon, sunrise is at 7:23 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 4:50 pm PST.

What is the month with the least sunshine in Grants Pass?

The month with the least sunshine in Grants Pass is December, with an average of 4.7h of sunshine.

How many hours of sunshine does Grants Pass have in December?

The average sunshine duration in December in Grants Pass is 4.7h.

What is the month with the lowest UV index in Grants Pass?

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

What is the UV index intensity in December in Grants Pass?

In December, the average daily maximum UV index in Grants Pass is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from unprotected exposure to UV radiation.

Average temperature in December
Grants Pass, OR

Average temperature in December - Grants Pass, OR
  • Average high temperature in December: 46°F

The warmest month (with the highest average high temperature) is August (84.7°F).
The month with the lowest average high temperature is December (46°F).

  • Average low temperature in December: 31.5°F

The month with the highest average low temperature is August (49.1°F).
The coldest month (with the lowest average low temperature) is December (31.5°F).

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Average pressure in December
Grants Pass, OR

Average pressure in December - Grants Pass, OR
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is August (29.99"Hg).

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Average wind speed in December
Grants Pass, OR

Average wind speed in December - Grants Pass, OR
  • Average wind speed in December: 3.7mph

The windiest month (with the highest average wind speed) is March (4mph).
The calmest month (with the lowest average wind speed) is August (3.2mph).

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Average humidity in December
Grants Pass, OR

Average humidity in December - Grants Pass, OR
  • Average humidity in December: 84%

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (63%).

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Average rainfall in December
Grants Pass, OR

Average rainfall in December - Grants Pass, OR
  • Average rainfall in December: 4.02"

The wettest month (with the highest rainfall) is December (4.02").
The driest month (with the least rainfall) is July (0.12").

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Average rainfall days in December
Grants Pass, OR

Average rainfall days in December - Grants Pass, OR
  • Average rainfall days in December: 15.9 days

The month with the highest number of rainy days is March (18.7 days).
The month with the least rainy days is August (2.5 days).

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Average snowfall in December
Grants Pass, OR

Average snowfall in December - Grants Pass, OR
  • Average snowfall in December: 0.51"

The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Grants Pass, OR

Average snowfall days in December - Grants Pass, OR
  • Average snowfall days in December: 1.1 days

The month with the highest number of snowfall days is February (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Grants Pass, OR

Average daylight in December / Average sunshine in December - Grants Pass, OR
  • Average daylight in December: 9h and 8min

The month with the longest days is June (Average daylight: 15h and 14min).
The month with the shortest days is December (Average daylight: 9h and 8min).

  • Average sunshine in December: 4.7h

The months with the most sunshine are July and August (Average sunshine: 11.8h).
The month with the least sunshine is December (Average sunshine: 4.7h).

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Average sunshine days in December
Grants Pass, OR

Average sunshine days in December - Grants Pass, OR
  • Average sunshine days in December: 13.5 days

The month with the most sunshine days is July (26.7 days).
The month with the least sunshine days is March (10.8 days).

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Average UV index in December
Grants Pass, OR

Average UV index in December - Grants Pass, 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
Grants Pass, OR

Average cloud cover in December - Grants Pass, OR
  • Average cloud cover in December: 52

The month with the most cloud cover is March (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 16).

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Average visibility in December
Grants Pass, OR

Average visibility in December - Grants Pass, OR
  • Average visibility in December: 4mi

The month with the highest visibility is August (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).

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