Santa Rosa Weather in December

December in Santa Rosa typically sees daytime highs of 14°C (57°F) and nighttime lows of 4°C (39°F). As the wettest month of the year, expect more rainfall than other months. It falls within the winter season.

Rainfall in Santa Rosa in December

Being the wettest month, having an umbrella on standby can help you avoid getting caught in the rain. This month experiences about 13 days of rain according to historical data, averaging 145 mm (5.7 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Santa Rosa in December

Temperatures in Santa Rosa in December top out at 14°C (57°F) and drop to 4°C (39°F) overnight. December is typically considered a winter month. Conditions are often most pleasant around the middle of the day. Nights drop to 4°C (39°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet. Experience the mildest weather of the year in December.

Sunshine in Santa Rosa in December

The area enjoys a balanced 160 hours of sunlight, ensuring it's neither too overcast nor too sunny.

December in Santa Rosa has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.

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Check the conditions for any month of the year.

• January
• February
• March
• April

• May
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• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Santa Rosa's climate page.

Santa Rosa Temperature in December

Min Temperature 4°C (39°F)  

Max Temperature 14°C (57°F)  

Chance of Rain 43%  

Precipitation 145 mm (5.7 in)  

Rainy days 13 days  

Sunshine 160 hours *  

Percentage Sunshine 55% *  

* Data from: Healdsburg, the United States of America (23 KM, 14 Miles).

What to Wear in Santa Rosa in December

Pack for changing conditions in Santa Rosa in December. Bring a mix of short and long sleeves, a warm layer like a hoodie or light jacket, and comfortable pants. The key is being able to add or remove layers as the days goes by. Prepare for significant rainfall with proper waterproof clothing and shoes. Sunglasses could come in handy during the sunnier parts of your trip.

What To Do in Santa Rosa in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

5/10

Cycling

5/10

Walking

5/10

Camping

3/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Santa Rosa's climate page.

More climate data for Santa Rosa

Temperature Rainfall Sunshine

See the full Santa Rosa climate overview or explore weather in the United States of America.