Conditions at Ataka in December
December: The Grand Finale
December matches January for the largest average swell height at 2.2m (7.2ft) and an average period of 8.0 seconds. The North Pacific and Sea of Japan are churning, and the direction mix is superb: NNW (27.4%), NW (10.6%), WNW (10.4%) and W (6.7%) total 55.1% of the swell from the ideal W-NW quadrant. Powerful, long-period groundswell is on tap.
The ideal wind window is 38%, with offshore E-ESE-SE-SSE flow at ~15%. As winter storms pass, the wind can swing offshore for extended stretches, delivering memorable sessions in the 6-10ft (1.8-3m) range. Water temp drops to 15.3°C (60°F), and air temps hover around 9.1°C (48°F). Step up the rubber.
Average Spot conditions at Ataka in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Ataka during December. 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 December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Ataka for December. 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.