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Conditions at Betty's Bay in December
December: Summer Kick-Off - Plenty of Groundswell, Less Clean Wind
December marks the return of full summer conditions. Average swell remains solid at 7ft (2.2m) and the period is 11.1s, with SW (30.4%) and SSW (16.8%) doing the heavy lifting - so Betty's Bay still receives consistent long-period groundswell from the Southern Ocean. The challenge is wind. ESE (18.8%), SE (15.9%) and SSE (11.8%) combine into a strong summer trade regime, pushing the ideal offshore-wind percentage down to 21%. Only the early morning, and the occasional NW push, offers clean conditions. Those dawn patrol windows are gold, often offering clean 5-8ft (1.5-2.4m) surf before the chop takes over. With air temps at 19.0C, water at 18.4C and only 0.72mm/day of rain, it is the most comfortable time to be in the water - just pick your wind window carefully.
Average Spot conditions at Betty's Bay in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Betty's Bay 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 Betty's Bay for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Betty's Bay 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 Betty's Bay.