Mount Vernon Weather in December

The climate in Mount Vernon during December can be summarized as cool and a little damp.

December is in the winter in Mount Vernon and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a cool 13°C (56°F), whilst at night 1°C (33°F) is normal.

On average December is the 5th driest month of the year in Mount Vernon with around 91mm 3.6 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.

On the flip side this corresponds to an average of 5.8 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 Mount Vernon in December 2025.