December weather forecastNapa Soda Springs, CA
December
Weather in December
The first month of the winter, December, is still a cool month in Napa Soda Springs, California, with an average temperature fluctuating between 40.1°F (4.5°C) and 54.5°F (12.5°C).Temperature
Napa Soda Springs's temperature records reveal December as the coldest month, marked by average highs of 54.5°F (12.5°C) and lows of 40.1°F (4.5°C).Humidity
In December, the average relative humidity in Napa Soda Springs is 72%.Rainfall
In Napa Soda Springs, during December, the rain falls for 11.4 days and regularly aggregates up to 2.76" (70mm) of precipitation. Throughout the year, in Napa Soda Springs, there are 77.8 rainfall days, and 16.02" (407mm) of precipitation is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 30min of daylight.On the first day of December, sunrise is at 7:08 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:58 pm PST.
Sunshine
December has the least sunshine of the year in Napa Soda Springs, 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 value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: The UV index of 3 during December translates into the following guidance:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Napa Soda Springs, 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
Napa Soda Springs, 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
Napa Soda Springs, 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
Napa Soda Springs, 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
Napa Soda Springs, 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
Napa Soda Springs, 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
Napa Soda Springs, CA
- Average daylight in December: 9h and 30min
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 36min
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
Napa Soda Springs, 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
Napa Soda Springs, 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
Napa Soda Springs, 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
Napa Soda Springs, 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).
