Nagano Weather in December

The climate in Nagano during December can be summarized as cool and reasonably dry.

December is in the winter in Nagano and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a cold 6°C (43°F), whilst at night -4°C (25°F) is normal.

On average December is the driest month of the year in Nagano with around 45mm 1.8 inches of rain making it a reasonably dry 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 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 Nagano in December 2024.