Conditions at Ataka in January
January: Peak Winter Juice
January brings the peak of the winter swell season to Ataka. With an average swell height of 2.2m (7.2ft) and an average period of 8.1 seconds, the Sea of Japan is living up to its reputation as a swell machine. The dominant swell directions for the month are NNW (32.9%), NW (9.8%), WNW (7.2%) and W (4.0%), meaning over half of all wave energy arrives from the ideal W-NW window. This is prime stuff for the northwest-facing beach.
The catch is wind. Offshore flow from E-ESE-SE-SSE only accounts for about 14% of the wind rose, while onshore NW-NNW winds blow around 15% of the time. The good news is that the 'window' of clean, offshore conditions is open 35% of the time, often as high pressure builds to the east and pulls in a light ESE flow. When that lines up with a 2m+ swell, Ataka is firing with punchy, powerful 6-8ft (1.8-2.4m) sets. Water temp sits at 12.2°C (54°F), so a full winter wetsuit, boots and gloves are non-negotiable.
Average Spot conditions at Ataka in January
Swell history for January
Wind history for January
Swell quality
Analyze the groundswell consistency at Ataka 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 Ataka for your next trip in January.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Ataka 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 Ataka.