Brentwood Weather in December

The climate in Brentwood during December can be summarized as cold and a little damp.

December is in the winter in Brentwood and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a freezing 3°C (37°F), whilst at night -7°C (19°F) is normal.

On average December is the 2nd wettest month of the year in Brentwood with around 98mm 3.9 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.

On the flip side this corresponds to an average of 5 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 Brentwood in December 2025.