December weather forecast
Robinson Ranch, CA

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Weather in December

The first month of the winter, December, is still a comfortable month in Robinson Ranch, California, with an average temperature fluctuating between 63°F (17.2°C) and 49.8°F (9.9°C).

Temperature

December, having an average high-temperature of 63°F (17.2°C) and an average low-temperature of 49.8°F (9.9°C), is the coldest month.

Humidity

In December, the average relative humidity is 60%.

Rainfall

The month with the most rainfall is December, when the rain falls for 6.7 days and typically aggregates up to 1.02" (26mm) of precipitation.

Daylight

With an average of 10h and 0min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 6:37 am and sunset at 4:41 pm. On the last day of December, sunrise is at 6:54 am and sunset at 4:52 pm PST.

Sunshine

With an average of 6.6h of sunshine, December has the least sunshine of the year.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The UV index of 4 during December translates into the following guidance:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation around mid-day is intense; avoid the Sun and stay safe. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Updated: Aug 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the coldest months?

December proves to be the coldest month, recording an average maximum temperature of 63°F (17.2°C) and a minimum temperature of 49.8°F (9.9°C).

What is the temperature in December?

The high-temperature during December is 63°F (17.2°C) and the low-temperature is 49.8°F (9.9°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines air temperature and relative humidity, in August is calculated to be 84.2°F (29°C).

What is the average humidity in December in Robinson Ranch?

In Robinson Ranch, the average relative humidity in December is 60%.

What is the rainiest month?

December is the month with the most rainfall. Rain falls for 6.7 days and accumulates 1.02" (26mm) of precipitation.

How much does it rain in December?

In Robinson Ranch, in December, during 6.7 rainfall days, 1.02" (26mm) of precipitation is typically accumulated.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 10h and 0min of daylight.

How many hours of daylight does Robinson Ranch have in December?

In Robinson Ranch, the average day length in December is 9h and 58min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 6:37 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 6:54 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 6.6h of sunshine.

How many hours of sunshine does Robinson Ranch have in December?

In Robinson Ranch, the average sunshine duration in December is 6.6h.

When is the lowest UV index?

January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index.

What is the UV index reading in December?

In Robinson Ranch, the average daily maximum UV index in December is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Robinson Ranch, CA

Average temperature in December - Robinson Ranch, CA
  • Average high temperature in December: 63°F

The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (63°F).

  • Average low temperature in December: 49.8°F

The month with the highest average low temperature is August (64.2°F).
The coldest month (with the lowest average low temperature) is February (48.9°F).

Average pressure in December
Robinson Ranch, CA

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

The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are June and September (29.88"Hg).

Average wind speed in December
Robinson Ranch, CA

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

The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

Average humidity in December
Robinson Ranch, CA

Average humidity in December - Robinson Ranch, CA
  • Average humidity in December: 60%

The months with the highest relative humidity are May and June (70%).
The month with the lowest relative humidity is November (56%).

Average rainfall in December
Robinson Ranch, CA

Average rainfall in December - Robinson Ranch, CA
  • Average rainfall in December: 1.02"

The wettest month (with the highest rainfall) is December (1.02").
The driest month (with the least rainfall) is June (0.08").

Average rainfall days in December
Robinson Ranch, CA

Average rainfall days in December - Robinson Ranch, CA
  • Average rainfall days in December: 6.7 days

The month with the highest number of rainy days is March (8.6 days).
The month with the least rainy days is June (1.9 days).

Average daylight in December /
Average sunshine in December
Robinson Ranch, CA

Average daylight in December / Average sunshine in December - Robinson Ranch, CA
  • Average daylight in December: 10h and 0min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in December: 6h and 4min

The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).

Average sunshine days in December
Robinson Ranch, CA

Average sunshine days in December - Robinson Ranch, CA
  • Average sunshine days in December: 22.7 days

The month with the most sunshine days is January (24.3 days).
The month with the least sunshine days is February (19.8 days).

Average UV index in December
Robinson Ranch, CA

Average UV index in December - Robinson Ranch, CA
  • Average UV index in December: 4

The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).

Average cloud cover in December
Robinson Ranch, CA

Average cloud cover in December - Robinson Ranch, CA
  • Average cloud cover in December: 25

The months with the most cloud cover are March and December (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 7).

Average visibility in December
Robinson Ranch, CA

Average visibility in December - Robinson Ranch, 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).

Robinson Ranch, California, USA

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