Lake Oswego Weather in December

The climate in Lake Oswego during December can be summarized as cool and wet.

December is in the winter in Lake Oswego and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a cold 7°C (45°F), whilst at night 1°C (33°F) is normal.

On average December is the wettest month of the year in Lake Oswego with around 193mm 7.6 inches of rain making it a wet time to visit. This rainfall is typically spread over 19 days, although this may vary considerably.

On the flip side this corresponds to an average of 2.4 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 Lake Oswego in December 2024.