December weather forecastSea Ranch, CA
December
Weather in December
December, the first month of the winter in Sea Ranch, is also a fresh month, with an average temperature varying between 39.9°F (4.4°C) and 54.7°F (12.6°C).Temperature
In Sea Ranch, the lowest average temperatures are observed in December, with a high of 54.7°F (12.6°C) and a low of 39.9°F (4.4°C).Humidity
The average relative humidity in December is 76%.Rainfall
In Sea Ranch, during December, the rain falls for 11.8 days and regularly aggregates up to 3.54" (90mm) of precipitation. In Sea Ranch, during the entire year, the rain falls for 83.1 days and collects up to 21.38" (543mm) of precipitation.Snowfall
January, March through December are months without snowfall.Ocean temperature
In December, the average ocean temperature is 54°F (12.2°C).Note: Diving into 54°F (12.2°C) when it's under 50°F (10°C) can cause immediate cold shock symptoms, marked by hyperventilation.
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 7:13 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 5:02 pm PST.
Sunshine
With an average of 5.4h of sunshine, December has the least sunshine of the year.UV index
February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: The average daily UV index of 3 in December transforms into the following instructions:
Guard yourself - Avoiding sunburn is suggested. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Sea Ranch, CA
- Average high temperature in December: 54.7°F
The warmest month (with the highest average high temperature) is August (83.5°F).
The month with the lowest average high temperature is December (54.7°F).
- Average low temperature in December: 39.9°F
The month with the highest average low temperature is August (54.1°F).
The coldest month (with the lowest average low temperature) is December (39.9°F).
Average pressure in December
Sea Ranch, CA
- Average pressure in December: 30.1"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
Sea Ranch, CA
- Average wind speed in December: 5.2mph
The windiest month (with the highest average wind speed) is May (6.8mph).
The calmest month (with the lowest average wind speed) is November (4.9mph).
Average humidity in December
Sea Ranch, CA
- Average humidity in December: 76%
The month with the highest relative humidity is March (78%).
The months with the lowest relative humidity are July and September (60%).
Average rainfall in December
Sea Ranch, CA
- Average rainfall in December: 3.54"
The wettest month (with the highest rainfall) is February (4.49").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in December
Sea Ranch, CA
- Average rainfall days in December: 11.8 days
The month with the highest number of rainy days is March (15 days).
The month with the least rainy days is August (0.9 days).
Average snowfall in December
Sea Ranch, CA
- Average snowfall in December: 0"
The month with the highest snowfall is February (0.2").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in December
Sea Ranch, CA
- Average snowfall days in December: 0 days
The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average sea temperature in December
Sea Ranch, CA
- Average sea temperature in December: 54°F
The best month for swimming (with the highest average sea temperature) is October (56°F).
The coldest month (with the lowest average sea temperature) is June (51.9°F).
Average daylight in December /
Average sunshine in December
Sea Ranch, 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 24min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in December
Sea Ranch, CA
- Average sunshine days in December: 17.5 days
The months with the most sunshine days are July and August (29.6 days).
The month with the least sunshine days is March (14.6 days).
Average UV index in December
Sea Ranch, 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 February, November and December (UV index 3).
Average cloud cover in December
Sea Ranch, CA
- Average cloud cover in December: 40
The month with the most cloud cover is March (Cloud cover 42).
The months with the least cloud cover are July and August (Cloud cover 6).
Average visibility in December
Sea Ranch, 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).
