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
In Yountville, December is the month with the lowest recorded average temperatures, measuring a high of 54.5°F (12.5°C) and a low of 40.1°F (4.5°C).Humidity
In Yountville, the average relative humidity in December is 72%.Rainfall
In Yountville, in December, it is raining for 11.4 days, with typically 2.76" (70mm) of accumulated precipitation. Throughout the year, there are 77.8 rainfall days, and 16.02" (407mm) of precipitation is accumulated.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year in Yountville.On the first day of December in Yountville, sunrise is at 7:08 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:59 pm PST.
Sunshine
The month with the least sunshine in Yountville, California, is December, with an average of 5.6h of sunshine.UV index
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 3 during December translates into the following recommendations:
Ensure safety - Sun damage prevention is strongly urged. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Frequently asked questions
What time of the year is the coldest in Yountville?
What is the average December temperature in Yountville?
What is the average humidity in December in Yountville?
How many days does it rain in December in Yountville?
What is the month with the shortest days in Yountville?
What is the average length of the day in December in Yountville?
What time are sunrise and sunset in December in Yountville?
What is the month with the least sunshine in Yountville?
How many hours of sunshine does Yountville have in December?
What are the months with the lowest UV index in Yountville?
What is the UV index intensity in December in Yountville?
Average temperature in December
Yountville, CA
- Average high temperature in December: 54.5°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is December (54.5°F).
- Average low temperature in December: 40.1°F
The month with the highest average low temperature is August (55.4°F).
The coldest month (with the lowest average low temperature) is December (40.1°F).
Average pressure in December
Yountville, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June and August (29.91"Hg).
Average wind speed in December
Yountville, CA
- Average wind speed in December: 4.7mph
The windiest month (with the highest average wind speed) is May (6mph).
The calmest month (with the lowest average wind speed) is November (4.3mph).
Average humidity in December
Yountville, CA
- Average humidity in December: 72%
The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is September (54%).
Average rainfall in December
Yountville, CA
- Average rainfall in December: 2.76"
The wettest month (with the highest rainfall) is February (3.43").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in December
Yountville, CA
- Average rainfall days in December: 11.4 days
The month with the highest number of rainy days is March (13.9 days).
The month with the least rainy days is August (0.9 days).
Average daylight in December /
Average sunshine in December
Yountville, CA
- Average daylight in December: 9h and 3min
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 30min).
- Average sunshine in December: 5h and 4min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).
Average sunshine days in December
Yountville, CA
- Average sunshine days in December: 18.7 days
The month with the most sunshine days is July (29.4 days).
The month with the least sunshine days is March (15.8 days).
Average UV index in December
Yountville, 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
Yountville, CA
- Average cloud cover in December: 38
The month with the most cloud cover is March (Cloud cover 40).
The month with the least cloud cover is July (Cloud cover 6).
Average visibility in December
Yountville, 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).
Yountville, California, USA
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