Conditions at Shonan in December
December: Winter Sets Settle In, Cold and Punchy
December closes the year with classic Shonan winter surf. The Siberian High is locked in, NNE winds run 26.9% of the time, and N/NNW/NW additions keep the ideal-wind percentage at 19%. Offshore texture is the rule, not the exception. Swell averages 2.3ft (0.7m) at 8.1s, with the wave rose led by SW (27.6%) and SSW (12.1%) -- and as always, the SSW/S/SSE/SE components are the ones that light up the sandbars. There is some real size lurking in the data: SW logs 5.4% of its readings in the 3-5ft (1-1.5m) range and SSW another 1.9%, with occasional 5-7ft (1.5-2m) sets. Air temperatures average 4.9C, water is 18.1C, and precipitation is at its lowest of the year at 1.87mm/day. Grab the thickest wetsuit; December delivers cold, clean and punchy waves to end the year.
Average Spot conditions at Shonan in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Shonan 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 Shonan for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Shonan 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 Shonan.