December weather forecast
Rubidoux, CA

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Weather in December

December, the first month of the winter in Rubidoux, is still a refreshing month, with an average temperature fluctuating between 45.9°F (7.7°C) and 63.3°F (17.4°C).

Temperature

With average temperatures fluctuating between a high of 63.3°F (17.4°C) and a low of 45.9°F (7.7°C), December stands out as the coldest month.

Humidity

In December, the average relative humidity is 51%.

Rainfall

The wettest months are February and December, with an average 1.61" (41mm) of rainfall.

Snowfall

January, March through December are months without snowfall.

Daylight

The month with the shortest days is December, with an average of 9h and 54min of daylight.
On the first day of the month, sunrise is at 6:37 am and sunset at 4:40 pm. On the last day of December, sunrise is at 6:54 am and sunset at 4:51 pm PST.

Sunshine

The months with the least sunshine are February and December, with an average of 6.8h of sunshine.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The UV index of 3 in December translates into these instructions:
Adopt protective measures - It is advised to guard against sun damage. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Updated: Aug 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month?

Temperature readings reach their annual highs in December, averaging 63.3°F (17.4°C) and a minimum average of 45.9°F (7.7°C).

What is the usual temperature for Rubidoux in December?

The high-temperature in Rubidoux during December is 63.3°F (17.4°C) and the low-temperature is 45.9°F (7.7°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in September is calculated to be 89.6°F (32°C).

What is the average humidity in December?

In December, the average relative humidity in Rubidoux is 51%.

What is the wettest month in Rubidoux?

The wettest months are February and December, with an average 1.61" (41mm) of rainfall.

How much does it rain in December?

In Rubidoux, during December, the rain falls for 5.8 days and regularly aggregates up to 1.61" (41mm) of precipitation.

When it does not snow?

January, March through December are months without snowfall.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 54min of daylight.

How many hours of daylight does Rubidoux have in December?

The average day length in December is 9h and 56min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 6:37 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 6:54 am and sunset at 4:51 pm PST.

What are the months with the least sunshine?

The months with the least sunshine are February and December, with an average of 6.8h of sunshine.

How many hours of sunshine does Rubidoux have in December?

The average sunshine duration in December is 6.8h.

What is the month with the lowest UV index?

December is the month with the lowest UV index, with an average maximum UV index of 3.

What is the UV index reading in December?

In December, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents 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
Rubidoux, CA

Average temperature in December - Rubidoux, CA
  • Average high temperature in December: 63.3°F

The warmest month (with the highest average high temperature) is August (91.2°F).
The month with the lowest average high temperature is December (63.3°F).

  • Average low temperature in December: 45.9°F

The month with the highest average low temperature is August (66.4°F).
The coldest month (with the lowest average low temperature) is December (45.9°F).

Average pressure in December
Rubidoux, CA

Average pressure in December - Rubidoux, CA
  • Average pressure in December: 30.07"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

Average wind speed in December
Rubidoux, CA

Average wind speed in December - Rubidoux, CA
  • Average wind speed in December: 5mph

The windiest month (with the highest average wind speed) is May (5.6mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).

Average humidity in December
Rubidoux, CA

Average humidity in December - Rubidoux, CA
  • Average humidity in December: 51%

The month with the highest relative humidity is May (56%).
The month with the lowest relative humidity is August (43%).

Average rainfall in December
Rubidoux, CA

Average rainfall in December - Rubidoux, CA
  • Average rainfall in December: 1.61"

The wettest months (with the highest rainfall) are February and December (1.61").
The driest month (with the least rainfall) is June (0.04").

Average rainfall days in December
Rubidoux, CA

Average rainfall days in December - Rubidoux, CA
  • Average rainfall days in December: 5.8 days

The month with the highest number of rainy days is March (7.7 days).
The month with the least rainy days is June (1.1 days).

Average snowfall days in December
Rubidoux, CA

Average snowfall days in December - Rubidoux, CA
  • Average snowfall days in December: 0 days

The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

Average daylight in December /
Average sunshine in December
Rubidoux, CA

Average daylight in December / Average sunshine in December - Rubidoux, CA
  • Average daylight in December: 9h and 5min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in December: 6h and 5min

The months with the most sunshine are July and August (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 48min).

Average sunshine days in December
Rubidoux, CA

Average sunshine days in December - Rubidoux, CA
  • Average sunshine days in December: 23.8 days

The month with the most sunshine days is June (27.9 days).
The month with the least sunshine days is February (21.6 days).

Average UV index in December
Rubidoux, CA

Average UV index in December - Rubidoux, CA
  • Average UV index in December: 3

The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).

Average cloud cover in December
Rubidoux, CA

Average cloud cover in December - Rubidoux, CA
  • Average cloud cover in December: 22

The months with the most cloud cover are February and March (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 5).

Average visibility in December
Rubidoux, CA

Average visibility in December - Rubidoux, 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).

Rubidoux, California, USA

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