Why Japan’s Regions Have Different Climates: 6 Key Factors

1. Latitude: Subtropical south (Okinawa) to cool north (Hokkaido).
2. Ocean currents: Warm Kuroshio (south) vs. cold Oyashio (north).
3. Mountain barriers: Japanese Alps split Pacific (wet) vs. Sea of Japan (dry/snowy) sides.
4. Distance from sea: Coastal moderation vs. inland extremes.
5. Monsoon winds: Winter Siberian cold/dry; summer Pacific warm/wet.
6. Micro-topography: Orographic rain on windward slopes; cold-air pooling in valleys.

Together they create striking diversity—from subtropical islands to alpine zones—in a compact archipelago.