December weather forecast
River Pines, CA

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Weather in December

The first month of the winter, December, is still a cool month in River Pines, California, with an average temperature varying between 52.9°F (11.6°C) and 37.9°F (3.3°C).

Temperature

The coldest time of the year is December, with temperatures averaging a high of 52.9°F (11.6°C) and a low of 37.9°F (3.3°C).

Humidity

In River Pines, the average relative humidity in December is 68%.

Rainfall

In December, the rain falls for 11 days. Throughout December, 4.02" (102mm) of precipitation is accumulated. Throughout the year, there are 81.8 rainfall days, and 23.39" (594mm) of precipitation is accumulated.

Snowfall

February, March, November and December are months with snowfall. December is the last month it regularly snows in River Pines. During 0.3 snowfall days, in December, River Pines aggregates 0.63" (16mm) of snow. Throughout the year, there are 2.8 snowfall days, and 4.65" (118mm) of snow is accumulated.

Daylight

December has the shortest days of the year in River Pines, with an average of 9h and 30min of daylight.
On the first day of December, sunrise is at 7:02 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:52 pm PST.

Sunshine

With an average of 6h of sunshine, December has the least sunshine of the year.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: The UV index of 3 during December leads to these advisories:
Make use of precautions - Suggestions to resist sunburn are communicated. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.

Frequently asked questions

What is the coldest month?

December is the coldest month, exhibiting average temperatures of 52.9°F (11.6°C) at the peak and 37.9°F (3.3°C) at the base.

What is the temperature in December?

In December, in River Pines, the average high-temperature is 52.9°F (11.6°C), and the average low-temperature is 37.9°F (3.3°C). The average heat index (a.k.a. 'feels like', 'real feel'), which combines relative humidity and air temperature, in September is calculated to be 84.2°F (29°C).

What is the average humidity in December?

In December, the average relative humidity is 68%.

How much does it rain in December?

In River Pines, during December, the rain falls for 11 days and regularly aggregates up to 4.02" (102mm) of precipitation.

What is the last month it snows?

December is the last month it regularly snows. During 0.3 snowfall days, in December, River Pines aggregates 0.63" (16mm) of snow.

What is the month with the shortest days?

With an average of 9h and 30min of daylight, December has the shortest days of the year in River Pines.

What is the average length of the day in December?

In River Pines, the average day length in December is 9h and 32min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:02 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:52 pm PST.

What is the month with the least sunshine?

The month with the least sunshine is December, with an average of 6h of sunshine.

How long on average sun shines in December?

In December, the average sunshine duration is 6h.

What is the month with the lowest UV index?

The months with the lowest UV index in River Pines are January, February, November and December, with an average maximum UV index of 3.

What is the UV index intensity in December?

The average daily maximum UV index in December in River Pines is 3. A UV Index of 3 to 5 symbolizes a moderate 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
River Pines, CA

Average temperature in December - River Pines, CA
  • Average high temperature in December: 52.9°F

The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is December (52.9°F).

  • Average low temperature in December: 37.9°F

The month with the highest average low temperature is July (59°F).
The coldest month (with the lowest average low temperature) is December (37.9°F).

Average pressure in December
River Pines, CA

Average pressure in December - River Pines, CA
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in December
River Pines, CA

Average wind speed in December - River Pines, CA
  • Average wind speed in December: 4.8mph

The windiest month (with the highest average wind speed) is February (5.7mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).

Average humidity in December
River Pines, CA

Average humidity in December - River Pines, CA
  • Average humidity in December: 68%

The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is July (40%).

Average rainfall in December
River Pines, CA

Average rainfall in December - River Pines, CA
  • Average rainfall in December: 4.02"

The wettest month (with the highest rainfall) is March (4.69").
The driest months (with the least rainfall) are July and August (0.04").

Average rainfall days in December
River Pines, CA

Average rainfall days in December - River Pines, CA
  • Average rainfall days in December: 11 days

The month with the highest number of rainy days is March (14.6 days).
The month with the least rainy days is August (1.5 days).

Average snowfall in December
River Pines, CA

Average snowfall in December - River Pines, CA
  • Average snowfall in December: 0.63"

The month with the highest snowfall is February (2.01").
The months with the least snowfall are January, April, May, June, July, August, September and October (0").

Average snowfall days in December
River Pines, CA

Average snowfall days in December - River Pines, CA
  • Average snowfall days in December: 0.3 days

The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
River Pines, CA

Average daylight in December / Average sunshine in December - River Pines, CA
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 6h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).

Average sunshine days in December
River Pines, CA

Average sunshine days in December - River Pines, CA
  • Average sunshine days in December: 18.6 days

The month with the most sunshine days is August (28.8 days).
The month with the least sunshine days is March (15.1 days).

Average UV index in December
River Pines, CA

Average UV index in December - River Pines, CA
  • Average UV index in December: 3

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).

Average cloud cover in December
River Pines, CA

Average cloud cover in December - River Pines, CA
  • Average cloud cover in December: 33

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 4).

Average visibility in December
River Pines, CA

Average visibility in December - River Pines, CA
  • 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).

River Pines, California, USA

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