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 American Canyon, December is the month with the lowest recorded average temperatures, measuring a high of 54.9°F (12.7°C) and a low of 42.3°F (5.7°C).Humidity
In December, the average relative humidity is 72%.Rainfall
In American Canyon, in December, during 9.9 rainfall days, 2.13" (54mm) of precipitation is typically accumulated. In American Canyon, during the entire year, the rain falls for 68.2 days and collects up to 11.93" (303mm) of precipitation.Daylight
December has the shortest days of the year, with an average of 9h and 36min of daylight.On the first day of the month, sunrise is at 7:07 am and sunset at 4:49 pm. On the last day of December, sunrise is at 7:25 am and sunset at 4:59 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 5.7h 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 value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The daily high UV index of 3 during December translates into the following recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months?
What is the temperature in December?
What is the average humidity in December?
How many days does it rain in December?
What is the month with the shortest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
What is the month with the least sunshine?
How long on average sun shines in December in American Canyon?
What are the months with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
American Canyon, CA
- Average high temperature in December: 54.9°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is December (54.9°F).
- Average low temperature in December: 42.3°F
The month with the highest average low temperature is August (56.5°F).
The coldest months (with the lowest average low temperature) are January and December (42.3°F).
Average pressure in December
American Canyon, 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
American Canyon, CA
- Average wind speed in December: 4.9mph
The windiest month (with the highest average wind speed) is May (6.6mph).
The calmest month (with the lowest average wind speed) is November (4.5mph).
Average humidity in December
American Canyon, CA
- Average humidity in December: 72%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is September (58%).
Average rainfall in December
American Canyon, CA
- Average rainfall in December: 2.13"
The wettest month (with the highest rainfall) is February (2.32").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in December
American Canyon, CA
- Average rainfall days in December: 9.9 days
The month with the highest number of rainy days is March (11.9 days).
The month with the least rainy days is August (0.9 days).
Average daylight in December /
Average sunshine in December
American Canyon, 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 4min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in December
American Canyon, CA
- Average sunshine days in December: 20.1 days
The months with the most sunshine days are July and August (29.1 days).
The month with the least sunshine days is March (18.3 days).
Average UV index in December
American Canyon, 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
American Canyon, CA
- Average cloud cover in December: 36
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 7).
Average visibility in December
American Canyon, 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).
American Canyon, California, USA
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