December weather forecastSunol, CA
December
Weather in December
The first month of the winter, December, is also a fresh month in Sunol, California, with an average temperature varying between 41.7°F (5.4°C) and 55°F (12.8°C).Temperature
In Sunol, the lowest temperatures are generally noted in December, averaging a high of 55°F (12.8°C) and a low of 41.7°F (5.4°C).Humidity
In Sunol, the average relative humidity in December is 71%.Rainfall
In Sunol, during December, the rain falls for 10.4 days and regularly aggregates up to 1.81" (46mm) of precipitation. Throughout the year, there are 70.2 rainfall days, and 10.98" (279mm) of precipitation is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 36min of daylight.On the first day of December in Sunol, sunrise is at 7:04 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:59 pm PST.
Sunshine
The month with the least sunshine in Sunol is December, with an average of 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 in Sunol. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: During December, 3 as the daily maximum UV index converts into the following advice:
Take precautions - Protection against skin and eye damage is obliged. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Sunol, CA
- Average high temperature in December: 55°F
The warmest month (with the highest average high temperature) is July (85.3°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 August (56.7°F).
The coldest month (with the lowest average low temperature) is January (41.5°F).
Average pressure in December
Sunol, 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, August and September (29.92"Hg).
Average wind speed in December
Sunol, CA
- Average wind speed in December: 4.7mph
The windiest month (with the highest average wind speed) is May (6.3mph).
The calmest month (with the lowest average wind speed) is November (4.2mph).
Average humidity in December
Sunol, CA
- Average humidity in December: 71%
The month with the highest relative humidity is March (74%).
The months with the lowest relative humidity are July and September (56%).
Average rainfall in December
Sunol, CA
- Average rainfall in December: 1.81"
The wettest month (with the highest rainfall) is February (2.05").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in December
Sunol, CA
- Average rainfall days in December: 10.4 days
The month with the highest number of rainy days is March (12.4 days).
The month with the least rainy days is August (0.9 days).
Average daylight in December /
Average sunshine in December
Sunol, CA
- Average daylight in December: 9h and 36min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 6h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days in December
Sunol, CA
- Average sunshine days in December: 19.6 days
The month with the most sunshine days is August (29 days).
The month with the least sunshine days is March (17.6 days).
Average UV index in December
Sunol, 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
Sunol, CA
- Average cloud cover in December: 34
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 5).
Average visibility in December
Sunol, 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).
