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Conditions at Sennen Cove in December
December: Peak Winter Punch
December is the statistical peak of the surf year at Sennen Cove, with average swell height matching January at 8ft (2.5m) and an average period of 11.2s. The wave rose shows a classic winter pattern: W 16.6%, WSW 12.2%, WNW 7.2%, and a growing contribution from SW (6.2%) and SSW (3.3%). A large portion of swell arrives with 6-8ft (2-2.5m) or greater heights, meaning the bay can easily reach pumping or heavy territory. The main challenge is wind - ideal offshore flow is only 8% of the time, and WSW, W, and WNW winds are common (10.0%, 7.5%, 7.2%), with a strong onshore NW component at 5.6%. The best days are cold and sparkling, with a light S or SSW wind and a big WNW swell wrapping into the bay. Water temp holds at 11.4°C, air at 10.1°C, and rain is plentiful, so bring all the rubber and your best paddling arms. This is when Sennen justifies its reputation.
Average Spot conditions at Sennen Cove in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Sennen Cove 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 Sennen Cove for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sennen Cove 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 Sennen Cove.