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Hokkaido is cold because a major area of extremely cold, yet relatively high pressure air develops over Siberia and Mongolia during the winter.

This is known as the Siberian High.

Air from the high pressure zone likes to move away to an area of lower pressure, as it moves away it tends to move slightly right of direction it was heading.

This is due to the rotation of the Earth, spinning faster at the Equator and slower at the poles, it is known as the Coriolis effect.

The dry, extremely cold and relatively high pressure air from the Siberian high moves south-eastwards over the ocean, warms up and draws moisture and then moves towards Hokkaido bathing this region with cold, moist and snowy air.

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15y ago

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