Conditions at Inamuragasaki in December
December: Winter Swell Core - SW Groundswell and Offshore Winds
December is all about the return of the southwest groundswell. The average swell is 0.7m (2.3ft) with period 8.1s, but SW alone accounts for 27.6% of all wave energy, with SSW adding 12.1%, S 7.1% and SSE 6.4% - a combined 53% from the most favourable directions. The wave heights are still mostly in the 0.5-1m (1.6-3.3ft) range, but there are more frequent 1-1.5m (3.3-4.9ft) pulses from SW (5.4%) and SSW (1.9%). Winds are the real winter gift: NNE (26.9%), NE (12.8%), N (8.9%) and NNW (6.9%) deliver offshore flow around 56% of the time, while onshore winds are at just 15%. Ideal conditions run 18%, and the beach is quiet. Water temperature cools to 18.0°C, air averages 4.9°C, and daily precipitation is the lowest of the year at 1.87 mm/day. December rewards the dedicated surfer with some of the cleanest, most consistent small-wave sessions of the season.
Average Spot conditions at Inamuragasaki in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Inamuragasaki 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 Inamuragasaki for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Inamuragasaki 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 Inamuragasaki.