Conditions at Choshi in December
December: Peak Season Offshore Magic
December is the best month of the year for surf at Choshi. The ideal offshore wind frequency peaks at 47%, driven by the full-strength Siberian High and consistent NNW/NW monsoon flow. The average swell height is a solid 5ft (1.6m), and the period reaches 9.8s, giving the waves real power and length. The wave rose shows NE/NNE energy leading, with NW/NNW swell present from locally generated seas. While south swell from the SE/S quadrant is a smaller part of the mix, it becomes more usable because the wind is so often offshore. Water temperatures have dropped to 15.1°C and air averages 11.3°C, so the winter chill is firmly in place. The combination of strong extratropical cyclone activity in the North Pacific, long fetch lengths, and offshore flow creates some of the most consistent, clean, rippable surf Choshi sees all year. This is the time to break out the winter rubber and circle the calendar.
Average Spot conditions at Choshi in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Choshi 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 Choshi for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Choshi 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 Choshi.