Temperatures in December
It's cool to moderate in December in Santa Rosa with an average temperature of 15°C. Temperatures this month range from a low of 13°C to a high of 17°C. At night, you can expect temperatures between 2°C and 7°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Santa Rosa in December. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of December
The month of December starts in Santa Rosa with cool temperatures, averaging around 16°C during the day and nights close to 6°C. You can expect regular precipitation, but there’s also a chance for some sunny days in the first days of the month.
Mid-December
By mid-December, the average daytime temperature drops to around 15°C, with nights close to 5°C. The chance of precipitation is high during this period.
End of December
By the end of December, the average daytime temperature in Santa Rosa will be around 15°C, with nights close to 4°C. There’s regular precipitation, but with a bit of luck, you’ll also get some dry and sunny days.
Discover cheap trips to Santa Rosa 
Precipitation in December
In December, there is an average of 159 mm of precipitation, spread over 11 days. The wind speed is around 3 Bft, mostly coming from the Southwest.
The average precipitation chance is 37% per day this month.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in December for Santa Rosa. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Santa Rosa in December |
London | ||
|---|---|---|---|
 Average Temperature |
15°C | 9°C | |
 High Temp |
17°C | 11°C | |
| Low Temp |
13°C | 8°C | |
 Total Precipitation |
159 mm | 67 mm | |
| Rainy Days |
11 days | 10 days | |
November
UV index
The UV index is a maximum of 5 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Is December a good time to visit Santa Rosa?
Looking for sun and warm weather? Then December isn’t the best time to be in Santa Rosa. The temperature is too low this month for a warm stay.
Temperature records for Santa Rosa in December
With 25°C, Santa Rosa hit the highest temperature in the last 10 years in December 2020. The lowest daytime temperature in this month was 6°C in 2021. The extreme night temperatures ranged from a low of -4°C to a high of 14°C.
Check out the climate of Santa Rosa for all months and discover the best travel time
Plan your next holiday
Don’t miss the best holiday deals for Santa Rosa and see what our partners have for you.
Daily Temperature in December in Santa Rosa
This chart shows the average daily temperatures, both day and night, for each day in December in Santa Rosa, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in December in Santa Rosa
The chart below shows the average daily precipitation in December for Santa Rosa, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for December, you can expect around 11 days of rain in Santa Rosa.
Daily UV Index in December in Santa Rosa
This chart shows the average daily UV index in December in Santa Rosa, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in December in Santa Rosa Over the Years
This chart shows the average temperature in December in Santa Rosa, measured in degrees Celsius, over the past years.
Total Precipitation in December in Santa Rosa Over the Years
This chart shows the average precipitation in December in Santa Rosa, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in December for Santa Rosa
Click on a specific day in December for detailed info on the typical weather on that day in Santa Rosa. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in December in Santa Rosa
Have you been to Santa Rosa in December?
Share your weather experience in December in Santa Rosa.
Average Weather in Santa Rosa by Month
Click on a month below to see detailed weather info for Santa Rosa. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of Santa Rosa for all months at once
