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 sea temperature 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
With an average high-temperature of 55.2°F (12.9°C) and an average low-temperature of 46.2°F (7.9°C), December is the coldest month.Humidity
The average relative humidity in December is 72%.Rainfall
In December, the rain falls for 9 days. Throughout December, 0.79" (20mm) of precipitation is accumulated. In Belvedere, California, during the entire year, the rain falls for 64.2 days and collects up to 4.8" (122mm) of precipitation.Ocean temperature
In December, the average ocean temperature is 54.5°F (12.5°C).Note: Dipping into 54.5°F (12.5°C) below 50°F (10°C) is possible with the right protection; absent that, anticipate cold shock and hampered breathing. Swimming momentarily at 55.4°F (13°C) can be jarring.
Daylight
With an average of 9h and 36min of daylight, December has the shortest days of the year in Belvedere.On the first day of December, sunrise is at 7:07 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 5:01 pm PST.
Sunshine
With an average of 5.7h of sunshine, December has the least sunshine of the year.UV index
The months with the lowest UV index in Belvedere are January, February, November and December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: An average UV index of 3 in December transforms into this advice:
Take precautions - Protection against skin and eye damage is obliged. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Frequently asked questions
What part of the year is the coldest in Belvedere?
What is the temperature in December in Belvedere?
What is the average humidity in December in Belvedere?
How many days does it rain in December in Belvedere?
What is the water temperature in December in Belvedere?
What is the month with the shortest days in Belvedere?
What is the average length of the day in December in Belvedere?
When are sunrise and sunset in December in Belvedere?
What is the month with the least sunshine in Belvedere?
How long on average sun shines in December in Belvedere?
What are the months with the lowest UV index in Belvedere?
How high is the UV index in December in Belvedere?
Average temperature in December
Belvedere, CA
- Average high temperature in December: 55.2°F
The warmest month (with the highest average high temperature) is September (72.3°F).
The month with the lowest average high temperature is December (55.2°F).
- Average low temperature in December: 46.2°F
The month with the highest average low temperature is September (56.5°F).
The coldest months (with the lowest average low temperature) are January and December (46.2°F).
Average pressure in December
Belvedere, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in December
Belvedere, CA
- Average wind speed in December: 6.4mph
The windiest month (with the highest average wind speed) is May (7.9mph).
The calmest months (with the lowest average wind speed) are October and November (5.7mph).
Average humidity in December
Belvedere, CA
- Average humidity in December: 72%
The months with the highest relative humidity are March and August (76%).
The month with the lowest relative humidity is October (68%).
Average rainfall in December
Belvedere, CA
- Average rainfall in December: 0.79"
The wettest month (with the highest rainfall) is February (0.98").
The driest months (with the least rainfall) are June, July, August and September (0.08").
Average rainfall days in December
Belvedere, CA
- Average rainfall days in December: 9 days
The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is June (1.9 days).
Average sea temperature in December
Belvedere, CA
- Average sea temperature in December: 54.5°F
The best month for swimming (with the highest average sea temperature) is September (57.3°F).
The coldest months (with the lowest average sea temperature) are April and June (53°F).
Average daylight in December /
Average sunshine in December
Belvedere, CA
- Average daylight in December: 9h and 4min
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 4min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in December
Belvedere, CA
- Average sunshine days in December: 20.9 days
The month with the most sunshine days is October (25 days).
The month with the least sunshine days is March (18.4 days).
Average UV index in December
Belvedere, CA
- Average UV index in December: 3
The months with the highest UV index are April, June, July, August and September (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in December
Belvedere, CA
- Average cloud cover in December: 36
The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is September (Cloud cover 18).
Average visibility in December
Belvedere, 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).
Belvedere, California, USA
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