Conditions at Monobegawakakou in December
December: Winter Offshore Flow, Smaller but Orderly
December closes the year with classic winter monsoon conditions. The ocean cools to 19.7°C, air averages 8.2°C, and the wind is heavily offshore: NNW (26.1%), NW (21.2%), WNW (12.9%) and N (7.4%) make up more than 67% of the wind rose. This creates some of the cleanest, most groomed surfaces of the year, but the swell engine is running low. Average height drops to 2ft (0.6m) and the period settles at 9.2s - smooth but small. ESE (25.1%) and SE (17.2%) remain the dominant swell directions, with SSE (9.1%), S (7.0%) and SSW (5.4%) offering occasional south energy. When a strong low-pressure system tracks through the East China Sea or a fetch forms south of Honshu, Monobegawakakou can still deliver tidy 2-4ft (0.6-1.2m) waves with glassy conditions. Don't sleep on December: the averages look low, but the percentage of wave-perfect mornings is surprisingly high.
Average Spot conditions at Monobegawakakou in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Monobegawakakou 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 Monobegawakakou for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Monobegawakakou 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 Monobegawakakou.