December weather forecastBig Sur, CA
December
Weather in December
Finally, December denotes the inception of winter in Big Sur, ushering in the year's lowest temperatures. The mercury continues its plunge, further descending from November's already chilly conditions. Rainfall hits its annual peak, reaching 2.48" (63mm) over 9.8 days, The magical ambiance of the holiday season amidst misty winter mornings and crisp, cold nights make December synonymous with a winter charm encompassing the picturesque landscapes and the Pacific coastline.Temperature
December is the month when Big Sur sees the lowest average temperatures, with a high of 57°F (13.9°C) and a low of 46.9°F (8.3°C).Humidity
In Big Sur, the average relative humidity in December is 72%.Rainfall
December is the month with the most rainfall. Rain falls for 9.8 days and accumulates 2.48" (63mm) of precipitation.Ocean temperature
In Big Sur, in December, the average water temperature is 55.4°F (13°C).Note: It is life-risking to swim in 55.4°F (13°C). Briefly staying in 55.4°F (13°C) waters feels unsettling, and temperatures below 50°F (10°C) might result in cold shock and loss of breath control, hinging on personal endurance.
Daylight
With an average of 9h and 42min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:00 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 5:02 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 5.9h of sunshine.UV index
The month with the lowest UV index is December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: The UV index of 3 during December translates into the following guidance:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Big Sur, CA
- Average high temperature in December: 57°F
The warmest month (with the highest average high temperature) is September (69.6°F).
The month with the lowest average high temperature is December (57°F).
- Average low temperature in December: 46.9°F
The month with the highest average low temperature is September (55.4°F).
The coldest month (with the lowest average low temperature) is December (46.9°F).
Average pressure in December
Big Sur, 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 (29.93"Hg).
Average wind speed in December
Big Sur, CA
- Average wind speed in December: 7.3mph
The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in December
Big Sur, CA
- Average humidity in December: 72%
The month with the highest relative humidity is August (79%).
The month with the lowest relative humidity is November (70%).
Average rainfall in December
Big Sur, CA
- Average rainfall in December: 2.48"
The wettest month (with the highest rainfall) is December (2.48").
The driest month (with the least rainfall) is August (0.04").
Average rainfall days in December
Big Sur, CA
- Average rainfall days in December: 9.8 days
The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is August (1.3 days).
Average sea temperature in December
Big Sur, CA
- Average sea temperature in December: 55°F
The best months for swimming (with the highest average sea temperature) are August, September and October (59°F).
The coldest months (with the lowest average sea temperature) are March, April and May (54°F).
Average daylight in December /
Average sunshine in December
Big Sur, CA
- Average daylight in December: 9h and 42min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in December: 5h and 54min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).
Average sunshine days in December
Big Sur, CA
- Average sunshine days in December: 20.3 days
The month with the most sunshine days is August (27.8 days).
The month with the least sunshine days is March (17.3 days).
Average UV index in December
Big Sur, CA
- Average UV index in December: 3
The months with the highest UV index are June, July, August and September (UV index 5).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in December
Big Sur, CA
- Average cloud cover in December: 33
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 13).
Average visibility in December
Big Sur, 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).
