Twain Harte Weather in December

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

The climate in Twain Harte during December can be summarized as cool and wet.

December is in the winter in Twain Harte and is typically the coldest month of the year. Daytime maximum temperatures average around a cold 9°C (49°F), whilst at night -2°C (29°F) is normal.

Twain Harte weather averages (imperial / metric)
Daytime temperature 9.2°C 48.6°F
Nightly temperature -1.8°C 28.8°F
Average temperature 3.7°C 38.7°F
Daily sunshine 5.9 hrs
Avg rainfall 164 mm 6.4 ins
Rainy days 7 days
Sea temperature 12.6°C 54.7°F
Humidity 77%
Windspeed 10.4kph 7 mph

On average December is the 2nd wettest month of the year in Twain Harte with around 164mm 6.4 inches of rain making it a wet time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.

On the flip side this corresponds to an average of 5.9 hours of sunshine per day.

December temperatures in Twain Harte

Twain Harte average temperature in December

December rainfall

Twain Harte average rain in December

December hourly sunshine

Twain Harte 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 Twain Harte in December 2025.

Other monthly averages

Best places to visit in December

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Twain Harte weather stats

Twain Harte weather statistics
Hottest month: July 30.6°C 87.1°F
Driest month: July 4mm 0.2ins
Sunniest month: July 14.2hrs
Coldest month: December 8.9°C 48°F
Wettest month: January 176mm 6.9ins
Map showing location of Twain Harte (38.03965, -120.23269) Twain Harte map pin © Google

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