The coldest region in Japan is Hokkaido, the northernmost island.

• Coldest Town: Rikubetsu is widely known as the coldest town in Japan, with temperatures frequently dropping below $-20^\circ\text{C}$ in winter.
• Historic Record: The city of Asahikawa holds the record for the lowest temperature ever recorded in Japan at $-41^\circ\text{C}$ (back in 1902).
• Snow Country: Regions like Aomori and Akita in the Tohoku area also experience extreme cold and some of the heaviest snowfall in the world.

Fun Fact: Japan's "Snow Country" (Yukiguni) is famous for having houses with entrances on the second floor because the snow gets so deep on the ground!