Napa

Napa Valley Weather in December

Average temperatures, rainfall, sunshine and the best places to visit in the Napa Valley, the United States of America in December.

Planning a getaway to the Napa Valley, the United States of America this December and curious about the weather you should prepare for? Discover all the vital details you need on this page, solving your puzzle:

What to Expect in the Napa Valley in December

The Napa Valley, the United States of America is a region in the United States of America. December in the Napa Valley generally has mild temperatures, with precipitation levels ranging from high to heavy. It's the height of winter.

Temperatures

You can expect mild maximum daytime temperatures of around 14°C (57°F) and nighttime temperatures around 4°C (39°F) in Napa. In general, this month stands out as the coldest period throughout the year. However, even though December is the coolest month, you can still find places in the Napa Valley, the United States of America with moderate temperatures, ensuring a pleasant experience throughout the year.

To learn more about the conditions in specific areas of the Napa Valley, the United States of America, check out the map below.

Precipitation

In December, precipitation varies across different areas. From high rainfall in American Canyon with an average of 101 mm (4 in) to heavy rainfall in Calistoga with 183 mm (7.2 in). Based on our climate, it is the month with the most precipitation throughout the year in Napa.

Average sunshine

Sunshine amounts are decent in most places. Napa gets approximately 160 hours of sunlight in December, offering a reasonable amount of both bright and cloudy periods. Curious about sunnier destinations? Our weather planner makes it easy to find places worldwide with pleasant weather.

Explore the Napa Valley by month

Pick a month to see the average temperature, rainfall and sunshine in the Napa Valley — and find the best time to visit. (based on Napa)

Best Places to Visit in the Napa Valley in December

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across the Napa Valley.

perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in the Napa Valley

What is the weather like in December for some of the most popular destinations in the Napa Valley, the United States of America?

Temperature range in the Napa Valley (December)

Precipitation variation in the Napa Valley (December)

Napa

In December Napa generally has moderate temperatures with maximum daytime temperatures around 14°C (57°F), minimum nighttime temperatures around 4°C (39°F) and high monthly rainfall. So on average the conditions are unpleasant that month.

November
December
January
Max temperature
19°C (66°F)
14°C (57°F)
15°C (59°F)
Min temperature
6°C (43°F)
4°C (39°F)
4°C (39°F)
Monthly sun hours
180 hours
160 hours
190 hours
Monthly rainfall
60 mm (2.4 in)
120 mm (4.7 in)
91 mm (3.6 in)
Monthly rainy days
7 days
11 days
9 days
Weather conditions

Calistoga

In December Calistoga generally has moderate temperatures with maximum daytime temperatures around 14°C (57°F), minimum nighttime temperatures around 3°C (37°F) and heavy monthly rainfall. So on average the conditions are poor that month.

November
December
January
Max temperature
19°C (66°F)
14°C (57°F)
15°C (59°F)
Min temperature
6°C (43°F)
3°C (37°F)
4°C (39°F)
Monthly sun hours
180 hours
160 hours
190 hours
Monthly rainfall
82 mm (3.2 in)
183 mm (7.2 in)
132 mm (5.2 in)
Monthly rainy days
8 days
13 days
9 days
Weather conditions

St. Helena

In December St. Helena generally has moderate temperatures with maximum daytime temperatures around 14°C (57°F), minimum nighttime temperatures around 4°C (39°F) and heavy monthly rainfall. So on average the conditions are unpleasant that month.

November
December
January
Max temperature
19°C (66°F)
14°C (57°F)
16°C (61°F)
Min temperature
6°C (43°F)
4°C (39°F)
4°C (39°F)
Monthly sun hours
180 hours
160 hours
190 hours
Monthly rainfall
76 mm (3 in)
175 mm (6.9 in)
125 mm (4.9 in)
Monthly rainy days
8 days
14 days
10 days
Weather conditions

Yountville

In December Yountville generally has moderate temperatures with maximum daytime temperatures around 14°C (57°F), minimum nighttime temperatures around 3°C (37°F) and high monthly rainfall. So on average the conditions are unpleasant that month.

November
December
January
Max temperature
19°C (66°F)
14°C (57°F)
15°C (59°F)
Min temperature
6°C (43°F)
3°C (37°F)
3°C (37°F)
Monthly sun hours
180 hours
160 hours
190 hours
Monthly rainfall
67 mm (2.6 in)
139 mm (5.5 in)
103 mm (4.1 in)
Monthly rainy days
8 days
12 days
9 days
Weather conditions

American Canyon

In December American Canyon generally has moderate temperatures with maximum daytime temperatures around 14°C (57°F), minimum nighttime temperatures around 4°C (39°F) and high monthly rainfall. So on average the conditions are unpleasant that month.

November
December
January
Max temperature
18°C (64°F)
14°C (57°F)
14°C (57°F)
Min temperature
6°C (43°F)
4°C (39°F)
3°C (37°F)
Monthly sun hours
173 hours
160 hours
186 hours
Monthly rainfall
50 mm (2 in)
101 mm (4 in)
79 mm (3.1 in)
Monthly rainy days
7 days
12 days
9 days
Weather conditions

Is your destination not in the list? Have a look at all destinations in the Napa Valley, in the United States of America.

Popular cities in December

Day & night temperatures, rainfall and average weather in the Napa Valley in December.

City Weather Day temp Night temp Rainfall
Napa 14°C (57°F) 4°C (39°F) 120 mm (4.7 in)
Calistoga 14°C (57°F) 3°C (37°F) 183 mm (7.2 in)
St. Helena 14°C (57°F) 4°C (39°F) 175 mm (6.9 in)
Yountville 14°C (57°F) 3°C (37°F) 139 mm (5.5 in)
American Canyon 14°C (57°F) 4°C (39°F) 101 mm (4 in)

The Napa Valley weather in December: frequently asked questions

What is the weather like in the Napa Valley, the United States of America in December?

the Napa Valley, the United States of America typically experiences unpleasant weather in December, part of the winter season. Daytime highs in Napa average around 14°C (57°F), and temperatures drop to about 4°C (39°F) at night.

What is the average temperature in the Napa Valley, the United States of America in December?

Napa averages a daytime maximum of 14°C (57°F) in December, with overnight lows close to 4°C (39°F).

Does the Napa Valley, the United States of America get a lot of rain in December?

the Napa Valley, the United States of America sees substantial rainfall in December. Napa typically averages about 120 mm (4.7 in), a mix of wet and dry days, but bring an umbrella.

Is December a Good Time to Visit the Napa Valley, the United States of America?

In our opinion, December may not be the ideal time to visit the Napa Valley, the United States of America due to the typically unpleasant weather in Napa.

On average, the best time to visit the Napa Valley, the United States of America is in April, May, June, July, August and October with generally perfect weather in Napa. On the other hand, the weather in February and December tend to be unpleasant.

Interested in more climate information?

We have much more information about the climate in the Napa Valley.

Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

Bucket list

Need travel inspiration? Check out our bucket list articles and be inspired.