1. Latitude: Hokkaido is located at a high latitude in the northern hemisphere, near the Arctic Circle. This means that it is farther away from the equator, where the sun's energy is most concentrated. As a result, Hokkaido receives less direct sunlight, which leads to lower temperatures.
2. Ocean currents: The Oyashio Current, a cold ocean current from the Sea of Okhotsk, flows along the eastern and northern coasts of Hokkaido. This current brings cold water from the Arctic Ocean into the region, further lowering temperatures.
3. Air masses: Cold air masses from Siberia can reach Hokkaido during the winter months. These air masses originate over the vast, cold landmass of Siberia, and they bring freezing temperatures to Hokkaido.
4. Land-sea interaction: Hokkaido has a unique land-sea interaction that contributes to its cold climate. The island is surrounded by ocean, which acts as a heat sink. This means that the ocean absorbs heat from the atmosphere, releasing it slowly over time. This process helps to keep Hokkaido cool during the summer months and cold during the winter months.
In addition to these factors, Hokkaido's climate is also influenced by its geography. The island's mountainous terrain creates localized weather patterns, such as valleys that experience heavy snowfall and areas that are protected from cold winds.