Conditions at Hokkaido in January
January: Frozen Offshore Windows and Short-Period Sea
The Siberian High is in full control, and the northwestern wind regime delivers frequent N/NNW and NW winds to the SSW-facing Hokkaido shoreline. On paper, that suggests clean offshore conditions, but the ocean is a short-period mess: the average wave period is just 6.6s and the average wave height is 2-3ft (0.8m). The swell rose is dominated by WSW and W energy (roughly 35% combined), with a secondary lobe of SSE/S/SSW/SW swell close to 30%. Those WSW/W swells are directional misfits for a SSW-facing beach, and the SSE/S swell that would ideally light it up is often wrapped in the same cold-air winds. Ideal wind sits at only 10%. When a low-pressure system tracks south of the islands and light N/NNE offshore winds set in, the best small windows appear. Air temps average -2.9°C and water temps sit at a numb 5.5°C, so thick rubber and patience are required.
Average Spot conditions at Hokkaido in January
Swell history for January
Wind history for January
Swell quality
Analyze the groundswell consistency at Hokkaido during January. Based on historical data, there is a % probability of groundswell occurring this month. The chart below provides a detailed breakdown of the average wave height distribution, offering deep insights into the swell quality and surf potential you can expect at Hokkaido for your next trip in January.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Hokkaido for January. Our analysis shows that favorable offshore or side-shore winds coincide with surfable swell approximately % of the time. The accompanying graph illustrates the average size distribution of waves during these optimal wind windows at Hokkaido.