Montalvin Weather in December

What's the weather like in Montalvin (California) in December 2025?

The climate in Montalvin during December can be summarized as cool and damp.

December is in the winter in Montalvin and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a cool 13°C (56°F), whilst at night 6°C (42°F) is normal.

Montalvin weather averages (imperial / metric)
Daytime temperature 13.4°C 56°F
Nightly temperature 5.7°C 42.2°F
Average temperature 9.5°C 49.1°F
Daily sunshine 5.6 hrs
Avg rainfall 109 mm 4.3 ins
Rainy days 10 days
Sea temperature 12.7°C 54.9°F
Humidity 80%
Windspeed 12.2kph 8 mph

On average December is the 2nd wettest month of the year in Montalvin with around 109mm 4.3 inches of rain making it a damp time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.

On the flip side this corresponds to an average of 5.6 hours of sunshine per day.

December temperatures in Montalvin

Montalvin average temperature in December

December rainfall

Montalvin average rain in December

December hourly sunshine

Montalvin average rain in December

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Montalvin in December 2025.