Cupertino Weather in December

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

December is in the winter in Cupertino and is typically the coldest month of the year. Daytime maximum temperatures average around a cool 13°C (56°F), whilst at night 3°C (37°F) is normal.

On average December is the 3rd wettest month of the year in Cupertino with around 123mm 4.8 inches of rain making it a wet time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 5.6 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 Cupertino in December 2024.