December weather forecastSouth Santa Rosa, CA
December
Weather in December
December, the first month of the winter in South Santa Rosa, is still a refreshing month, with an average temperature ranging between min 42.4°F (5.8°C) and max 55.6°F (13.1°C).Temperature
South Santa Rosa experiences its lowest average temperatures in December, reaching a peak of 55.6°F (13.1°C) and a minimum of 42.4°F (5.8°C).Humidity
In December, the average relative humidity is 74%.Rainfall
In December, the rain falls for 6.4 days. Throughout December, 0.67" (17mm) of precipitation is accumulated. Throughout the year, there are 44.3 rainfall days, and 3.78" (96mm) of precipitation is accumulated.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 7:09 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 5:00 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 5.7h of sunshine.UV index
January, 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 moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In December, the average maximum UV index of 3 translates into the following recommendations:
Ensure safety - Sun damage prevention is strongly urged. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
South Santa Rosa, CA
- Average high temperature in December: 55.6°F
The warmest months (with the highest average high temperature) are July and August (79.9°F).
The month with the lowest average high temperature is December (55.6°F).
- Average low temperature in December: 42.4°F
The months with the highest average low temperature are August and September (55°F).
The coldest month (with the lowest average low temperature) is December (42.4°F).
Average pressure in December
South Santa Rosa, 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
South Santa Rosa, 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 (4.7mph).
Average humidity in December
South Santa Rosa, CA
- Average humidity in December: 74%
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is September (62%).
Average rainfall in December
South Santa Rosa, CA
- Average rainfall in December: 0.67"
The wettest month (with the highest rainfall) is February (0.91").
The driest months (with the least rainfall) are June, July, August and September (0.04").
Average rainfall days in December
South Santa Rosa, CA
- Average rainfall days in December: 6.4 days
The month with the highest number of rainy days is March (8.7 days).
The month with the least rainy days is August (0.5 days).
Average daylight in December /
Average sunshine in December
South Santa Rosa, 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 42min
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 42min).
Average sunshine days in December
South Santa Rosa, CA
- Average sunshine days in December: 22.5 days
The month with the most sunshine days is June (27.7 days).
The month with the least sunshine days is March (20.8 days).
Average UV index in December
South Santa Rosa, CA
- Average UV index in December: 3
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in December
South Santa Rosa, CA
- Average cloud cover in December: 37
The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in December
South Santa Rosa, 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).
