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
The coldest time of the year is December, with temperatures averaging a high of 55°F (12.8°C) and a low of 41.7°F (5.4°C).Humidity
In Rio Vista, California, the average relative humidity in December is 71%.Rainfall
In Rio Vista, in December, during 9.7 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. In Rio Vista, California, during the entire year, the rain falls for 68.7 days and collects up to 11.18" (284mm) of precipitation.Daylight
The month with the shortest days in Rio Vista, California, is December, with an average of 9h and 36min of daylight.On the first day of December in Rio Vista, sunrise is at 7:05 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:57 pm PST.
Sunshine
With an average of 5.9h of sunshine, December has the least sunshine of the year.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum UV index of 3 during December translates into these guidelines:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Frequently asked questions
What month is the coldest in Rio Vista?
What is the usual temperature for Rio Vista in December?
What is the average humidity in December in Rio Vista?
How many days does it rain in December in Rio Vista?
What is the month with the shortest days in Rio Vista?
How many hours of daylight does Rio Vista have in December?
When are sunrise and sunset in December in Rio Vista?
What is the month with the least sunshine in Rio Vista?
How long on average sun shines in December in Rio Vista?
What is the month with the lowest UV index in Rio Vista?
What is the UV index reading in December in Rio Vista?
Average temperature in December
Rio Vista, CA
- Average high temperature in December: 55°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is December (55°F).
- Average low temperature in December: 41.7°F
The month with the highest average low temperature is September (58.1°F).
The coldest month (with the lowest average low temperature) is January (41.5°F).
Average pressure in December
Rio Vista, 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 (29.91"Hg).
Average wind speed in December
Rio Vista, CA
- Average wind speed in December: 5.3mph
The windiest month (with the highest average wind speed) is June (7.6mph).
The calmest month (with the lowest average wind speed) is November (4.7mph).
Average humidity in December
Rio Vista, CA
- Average humidity in December: 71%
The months with the highest relative humidity are January and March (74%).
The month with the lowest relative humidity is September (49%).
Average rainfall in December
Rio Vista, CA
- Average rainfall in December: 1.73"
The wettest month (with the highest rainfall) is February (2.17").
The driest month (with the least rainfall) is August (0").
Average rainfall days in December
Rio Vista, CA
- Average rainfall days in December: 9.7 days
The month with the highest number of rainy days is March (13 days).
The month with the least rainy days is August (0.7 days).
Average daylight in December /
Average sunshine in December
Rio Vista, CA
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 5h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).
Average sunshine days in December
Rio Vista, CA
- Average sunshine days in December: 20.5 days
The month with the most sunshine days is August (29.9 days).
The month with the least sunshine days is March (17.3 days).
Average UV index in December
Rio Vista, 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
Rio Vista, CA
- Average cloud cover in December: 35
The months with the most cloud cover are March and December (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in December
Rio Vista, 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).
Rio Vista, California, USA
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