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 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
December, known for its average high temperature of 55.6°F (13.1°C) and an average low temperature of 42.4°F (5.8°C), is the coldest month.Humidity
The average relative humidity in December in South Santa Rosa is 74%.Rainfall
In December, in South Santa Rosa, California, 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
The month with the shortest days in South Santa Rosa is December, with an average of 9h and 30min of daylight.On the first day of December in South Santa Rosa, California, 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
The month with the least sunshine in South Santa Rosa is December, 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 in South Santa Rosa. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The UV index of 3 during December translates into the following guidance:
Undertake precautions - Obligation exists to protect against skin and eye damage. When the Sun is at its strongest around midday, find shade and limit exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Frequently asked questions
What is the coldest time of year in South Santa Rosa?
What is the average December temperature in South Santa Rosa?
What is the average humidity in December in South Santa Rosa?
How much does it rain in South Santa Rosa in December?
What is the month with the shortest days in South Santa Rosa?
How many hours of daylight does South Santa Rosa have in December?
When is the sunrise / sunset in December in South Santa Rosa?
What is the month with the least sunshine in South Santa Rosa?
How long on average sun shines in December in South Santa Rosa?
When is the lowest UV index in South Santa Rosa?
What is the UV index intensity in December in South Santa Rosa?
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 3min
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 4min
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).
South Santa Rosa, California, USA
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