December weather forecastRiver Oaks, CA
December
Weather in December
The first month of the winter, December, is still a mild month in River Oaks, California, with an average temperature varying between 40.6°F (4.8°C) and 57.6°F (14.2°C).Temperature
River Oaks's December weather reaches an average high of 57.6°F (14.2°C) and an average low of 40.6°F (4.8°C), making it the coldest month.Humidity
The average relative humidity in December is 71%.Rainfall
The month with the most rainfall in River Oaks is December, when the rain falls for 7.4 days and typically aggregates up to 1.02" (26mm) of precipitation.Daylight
The month with the shortest days is December, with an average of 9h and 42min of daylight.On the first day of the month, sunrise is at 7:01 am and sunset at 4:50 pm. On the last day of December, in River Oaks, sunrise is at 7:19 am and sunset at 5:00 pm PST.
Sunshine
With an average of 6h of sunshine, December has the least sunshine of the year in River Oaks.UV index
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in River Oaks. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, the maximum UV index of 3 suggests these recommendations:
Preventative actions are necessary - Recommendations to ward off sunburn are given. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
River Oaks, CA
- Average high temperature in December: 57.6°F
The warmest months (with the highest average high temperature) are July and August (84.7°F).
The month with the lowest average high temperature is December (57.6°F).
- Average low temperature in December: 40.6°F
The month with the highest average low temperature is August (54.3°F).
The coldest months (with the lowest average low temperature) are February, March and December (40.6°F).
Average pressure in December
River Oaks, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in December
River Oaks, CA
- Average wind speed in December: 4mph
The windiest month (with the highest average wind speed) is May (5.3mph).
The calmest month (with the lowest average wind speed) is November (3.9mph).
Average humidity in December
River Oaks, CA
- Average humidity in December: 71%
The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is September (58%).
Average rainfall in December
River Oaks, CA
- Average rainfall in December: 1.02"
The wettest month (with the highest rainfall) is December (1.02").
The driest months (with the least rainfall) are June, July, August and September (0.04").
Average rainfall days in December
River Oaks, CA
- Average rainfall days in December: 7.4 days
The month with the highest number of rainy days is March (9 days).
The month with the least rainy days is August (0.5 days).
Average daylight in December /
Average sunshine in December
River Oaks, CA
- Average daylight in December: 9h and 42min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in December: 6h
The months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6h).
Average sunshine days in December
River Oaks, CA
- Average sunshine days in December: 22.3 days
The month with the most sunshine days is August (29.6 days).
The month with the least sunshine days is February (20.6 days).
Average UV index in December
River Oaks, 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 Oaks, CA
- Average cloud cover in December: 34
The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is July (Cloud cover 7).
Average visibility in December
River Oaks, 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).
