December weather forecastFort Ross, CA
December
Weather in December
December, the first month of the winter in Fort Ross, is also a moderate month, with an average temperature varying between 41.4°F (5.2°C) and 56.3°F (13.5°C).Temperature
In Fort Ross, California, December records the lowest average temperatures, peaking at 56.3°F (13.5°C) and reaching a low of 41.4°F (5.2°C).Humidity
In December, the average relative humidity in Fort Ross is 76%.Rainfall
In Fort Ross, during December, the rain falls for 8.6 days and regularly aggregates up to 2.32" (59mm) of precipitation. Throughout the year, there are 60.1 rainfall days, and 12.87" (327mm) of precipitation is accumulated.Daylight
December has the shortest days of the year in Fort Ross, with an average of 9h and 30min of daylight.On the first day of December, sunrise is at 7:12 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 5:02 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 5.4h of sunshine.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: A maximum high daily UV index of 3 during December translates into the following directions:
Make use of precautions - Shielding skin and eyes from injury is a requirement. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Fort Ross, CA
- Average high temperature in December: 56.3°F
The warmest month (with the highest average high temperature) is August (81°F).
The month with the lowest average high temperature is December (56.3°F).
- Average low temperature in December: 41.4°F
The months with the highest average low temperature are August and September (53.4°F).
The coldest month (with the lowest average low temperature) is December (41.4°F).
Average pressure in December
Fort Ross, 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
Fort Ross, CA
- Average wind speed in December: 5.2mph
The windiest month (with the highest average wind speed) is May (7.2mph).
The calmest month (with the lowest average wind speed) is November (5mph).
Average humidity in December
Fort Ross, CA
- Average humidity in December: 76%
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is September (62%).
Average rainfall in December
Fort Ross, CA
- Average rainfall in December: 2.32"
The wettest month (with the highest rainfall) is February (3.27").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in December
Fort Ross, CA
- Average rainfall days in December: 8.6 days
The month with the highest number of rainy days is March (10.3 days).
The month with the least rainy days is August (0.9 days).
Average daylight in December /
Average sunshine in December
Fort Ross, 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 month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in December
Fort Ross, CA
- Average sunshine days in December: 21.3 days
The month with the most sunshine days is July (28.9 days).
The month with the least sunshine days is February (19.9 days).
Average UV index in December
Fort Ross, 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
Fort Ross, CA
- Average cloud cover in December: 39
The month with the most cloud cover is March (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility in December
Fort Ross, 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).
