Gresham Weather in December

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

December is in the winter in Gresham 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 Gresham with around 243mm 9.6 inches of rain making it a very wet time to visit. This rainfall is typically spread over 18 days, although this may vary considerably.

On the flip side this corresponds to an average of 2.3 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 Gresham in December 2025.