Montesano Weather in December

The climate in Montesano during December can be summarized as cool and very wet.

December is in the winter in Montesano and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a cold 8°C (46°F), whilst at night 1°C (34°F) is normal.

On average December is the wettest month of the year in Montesano with around 331mm 13 inches of rain making it a very wet time to visit. This rainfall is typically spread over 22 days, although this may vary considerably.

On the flip side this corresponds to an average of 2.2 hours of sunshine per day.

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 Montesano in December 2025.