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, characterized by an average high temperature of 55.6°F and a low temperature of 41.9°F, is generally the coldest month.Humidity
The average relative humidity in December is 75%.Rainfall
In Santa Rosa, during December, the rain falls for 10.5 days and regularly aggregates up to 2.24" of precipitation. Throughout the year, in Santa Rosa, there are 72.8 rainfall days, and 12.01" of precipitation is accumulated.Daylight
The month with the shortest days in Santa Rosa is December, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 7:09 am and sunset at 4:50 pm. On the last day of December, sunrise is at 7:27 am and sunset at 4:59 pm PST.
Sunshine
December has the least sunshine of the year in Santa Rosa, 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 Santa Rosa. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In December, the UV index of 3 transforms into the following advice:
Be vigilant - Preventing sunburn is recommended. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
FAQ
What time of the year is the coldest in Santa Rosa?
What are the temperatures in Santa Rosa in December?
What is the average humidity in December in Santa Rosa?
How many days does it rain in December in Santa Rosa?
What is the month with the shortest days in Santa Rosa?
How many hours of daylight does Santa Rosa have in December?
What time are sunrise and sunset in December in Santa Rosa?
What is the month with the least sunshine in Santa Rosa?
How many hours of sunshine does Santa Rosa have in December?
What is the month with the lowest UV index in Santa Rosa?
How high is the UV index in December in Santa Rosa?
Average temperature in December
Santa Rosa, CA
- Average high temperature in December: 55.6°F
The warmest month (with the highest average high temperature) is August (79.7°F).
The month with the lowest average high temperature is December (55.6°F).
- Average low temperature in December: 41.9°F
The months with the highest average low temperature are August and September (54.7°F).
The coldest month (with the lowest average low temperature) is December (41.9°F).
Average pressure in December
Santa Rosa, 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
Santa Rosa, CA
- Average wind speed in December: 5.2mph
The windiest month (with the highest average wind speed) is May (7.1mph).
The calmest month (with the lowest average wind speed) is November (4.9mph).
Average humidity in December
Santa Rosa, CA
- Average humidity in December: 75%
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is September (63%).
Average rainfall in December
Santa Rosa, CA
- Average rainfall in December: 2.24"
The wettest month (with the highest rainfall) is February (2.64").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in December
Santa Rosa, CA
- Average rainfall days in December: 10.5 days
The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is August (0.8 days).
Average daylight in December /
Average sunshine in December
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
Santa Rosa, CA
- Average sunshine days in December: 19.5 days
The month with the most sunshine days is July (27.2 days).
The month with the least sunshine days is March (17.1 days).
Average UV index in December
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
Santa Rosa, CA
- Average cloud cover in December: 37
The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in December
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).
Santa Rosa, California, USA
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