December weather forecast and climate
Rubidoux, CA

Weather in December

The first month of the winter, December, is still a comfortable month in Rubidoux, California, with average temperature ranging between max 63.3°F (17.4°C) and min 45.9°F (7.7°C).

Temperature

December is the coldest month, with an average high-temperature of 63.3°F (17.4°C) and an average low-temperature of 45.9°F (7.7°C).

Humidity

In Rubidoux, 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

With an average of 9.9h of daylight, December has the shortest days of the year.

Sunshine

Months with the least sunshine in Rubidoux, California, are February and December, with an average of 6.8h of sunshine.

UV index

The month with the lowest UV index in Rubidoux is December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.
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FAQ

What is the coldest month in Rubidoux?

With an average high-temperature of 63.3°F (17.4°C) and an average low-temperature of 45.9°F (7.7°C), December is the coldest month.

What is the average humidity in December in Rubidoux?

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

What is the wettest month in Rubidoux?

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

How much does it rain in Rubidoux in December?

In Rubidoux, in December, it is raining for 5.8 days, with typically 1.61" (41mm) of accumulated precipitation.

When it does not snow in Rubidoux?

In Rubidoux snow does not fall in January, March through December.

What is the month with the shortest days in Rubidoux?

With an average of 9.9h of daylight, December has the shortest days of the year in Rubidoux, California.

How many hours of daylight does Rubidoux have in December?

In December, the average length of the day in Rubidoux is 9.9h.

What is the month with the least sunshine in Rubidoux?

Months with the least sunshine in Rubidoux, California, are February and December, with an average of 6.8h of sunshine.

How long on average sun shines in December in Rubidoux?

In December, the average sunshine in Rubidoux, California, is 6.8h.

What is the month with the lowest UV index in Rubidoux?

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

What is the UV index reading in December in Rubidoux?

The average daily maximum UV index in December in Rubidoux, California, is 3. A UV Index reading of 3 to 5 represents a medium health risk from unprotected exposure to the UV radiation.

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).

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Average pressure in December
Rubidoux, CA

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

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

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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).

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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%).

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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").

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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).

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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).
Months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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

Average daylight in December / Average sunshine in December - Rubidoux, CA
  • Average daylight in December: 9.9h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in December: 6.8h

Months with the most sunshine are July and August (Average sunshine: 12.1h).
Months with the least sunshine are February and December (Average sunshine: 6.8).

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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).

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Average UV index in December
Rubidoux, CA

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

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).

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Average cloud cover in December
Rubidoux, CA

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

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).

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Average visibility in December
Rubidoux, CA

Average visibility in December - Rubidoux, CA
  • Average visibility in December: 6mi

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

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