December weather forecastBelmont, CA
December
Weather in December
December, the first month of the winter in Belmont, is also a moderate month, with an average temperature fluctuating between 46.2°F (7.9°C) and 55.9°F (13.3°C).Temperature
The coldest month is December, with an average high-temperature of 55.9°F (13.3°C) and an average low-temperature of 46.2°F (7.9°C).Humidity
The average relative humidity in December is 71%.Rainfall
In December, the rain falls for 11 days. Throughout December, 1.89" (48mm) of precipitation is accumulated. In Belmont, during the entire year, the rain falls for 77.5 days and collects up to 11.22" (285mm) of precipitation.Daylight
The month with the shortest days is December, with an average of 9h and 36min of daylight.On the first day of December, sunrise is at 7:05 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 5:01 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 5.8h of sunshine.UV index
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 medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: A daily maximum UV index of 3 in December translates into the following instructions:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Belmont, CA
- Average high temperature in December: 55.9°F
The warmest month (with the highest average high temperature) is August (73°F).
The month with the lowest average high temperature is December (55.9°F).
- Average low temperature in December: 46.2°F
The month with the highest average low temperature is September (56.7°F).
The coldest month (with the lowest average low temperature) is January (46°F).
Average pressure in December
Belmont, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).
Average wind speed in December
Belmont, CA
- Average wind speed in December: 6.4mph
The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is October (5.5mph).
Average humidity in December
Belmont, CA
- Average humidity in December: 71%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (68%).
Average rainfall in December
Belmont, CA
- Average rainfall in December: 1.89"
The wettest month (with the highest rainfall) is February (2.09").
The driest months (with the least rainfall) are July and August (0.08").
Average rainfall days in December
Belmont, CA
- Average rainfall days in December: 11 days
The month with the highest number of rainy days is March (13 days).
The month with the least rainy days is July (1.8 days).
Average daylight in December /
Average sunshine in December
Belmont, 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: 5h and 48min
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 48min).
Average sunshine days in December
Belmont, CA
- Average sunshine days in December: 19.3 days
The month with the most sunshine days is July (25.3 days).
The month with the least sunshine days is March (16.3 days).
Average UV index in December
Belmont, CA
- Average UV index in December: 3
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are February, November and December (UV index 3).
Average cloud cover in December
Belmont, 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 9).
Average visibility in December
Belmont, 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).
