Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
Riverdale experiences its lowest average temperatures in December, reaching a peak of 57.2°F (14°C) and a minimum of 43°F (6.1°C).Humidity
January and December, with an average relative humidity of 66%, are the most humid months.Rainfall
In Riverdale, California, during December, the rain falls for 8.2 days and regularly aggregates up to 1.42" (36mm) of precipitation. In Riverdale, during the entire year, the rain falls for 58.2 days and collects up to 9.29" (236mm) of precipitation.Daylight
With an average of 9h and 42min of daylight, December has the shortest days of the year in Riverdale.On the first day of December, sunrise is at 6:53 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 4:54 pm PST.
Sunshine
December has the least sunshine of the year in Riverdale, with an average of 6.4h of sunshine.UV index
January, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Riverdale. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: A maximum high UV index of 3 in December translates into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Frequently asked questions
What time of the year is the coldest in Riverdale?
What is the average December temperature in Riverdale?
What is the most humid month in Riverdale?
What is the average humidity in December in Riverdale?
How much does it rain in Riverdale in December?
What is the month with the shortest days in Riverdale?
How many hours of daylight does Riverdale have in December?
When is the sunrise / sunset in December in Riverdale?
What is the month with the least sunshine in Riverdale?
How many hours of sunshine does Riverdale have in December?
What is the month with the lowest UV index in Riverdale?
What is the UV index intensity in December in Riverdale?
Average temperature in December
Riverdale, CA
- Average high temperature in December: 57.2°F
The warmest month (with the highest average high temperature) is July (102.2°F).
The month with the lowest average high temperature is December (57.2°F).
- Average low temperature in December: 43°F
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is December (43°F).
Average pressure in December
Riverdale, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Riverdale, CA
- Average wind speed in December: 4.9mph
The windiest month (with the highest average wind speed) is June (7.1mph).
The calmest months (with the lowest average wind speed) are January and November (4.8mph).
Average humidity in December
Riverdale, CA
- Average humidity in December: 66%
The months with the highest relative humidity are January and December (66%).
The month with the lowest relative humidity is July (30%).
Average rainfall in December
Riverdale, CA
- Average rainfall in December: 1.42"
The wettest months (with the highest rainfall) are January, February and March (1.54").
The driest month (with the least rainfall) is August (0.08").
Average rainfall days in December
Riverdale, CA
- Average rainfall days in December: 8.2 days
The month with the highest number of rainy days is March (9.6 days).
The month with the least rainy days is August (0.8 days).
Average daylight in December /
Average sunshine in December
Riverdale, CA
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in December: 6h and 2min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).
Average sunshine days in December
Riverdale, CA
- Average sunshine days in December: 21.8 days
The month with the most sunshine days is August (29.3 days).
The month with the least sunshine days is February (19.4 days).
Average UV index in December
Riverdale, CA
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, November and December (UV index 3).
Average cloud cover in December
Riverdale, CA
- Average cloud cover in December: 28
The months with the most cloud cover are March and December (Cloud cover 28).
The month with the least cloud cover is August (Cloud cover 4).
Average visibility in December
Riverdale, 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).
Riverdale, California, USA
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