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Conditions at Ansteys in December
December: Peak Summer Swell Window, Short-Period Problems
December rounds out the year with some of the best swell direction percentages of all months. Average height is 5ft (1.6m), but period drops to 8.7s, the lowest of the year, and ideal wind is 17%. The E/ESE/SE/SSE window is extremely active, with SSE posting 20.2%, E 18.6%, SE 16.7%, ESE 14.5%, and S 15.7%. Combined, the ideal E-SE sector makes up around 70% of the total swell. If you can find clean conditions, there will be plenty of 3-6ft (1-2m) peaks to work with.
However, the NE summer trade regime is in full swing. NE winds sit at 23.8%, SSW at 18.0%, and the offshore W/NW/NNW quadrant is almost absent. The onshore E/ESE/SE/SSE component is at its annual high near 16%, adding further roughness. Water temperature rises to 24.1°C, air averages 23.3°C, and daily precipitation is 3.69mm. December is a low-consistency month: small windows of light offshore or early-morning glass are your best bet, but do not expect winter-grade cleanliness.
Average Spot conditions at Ansteys in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Ansteys 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 Ansteys for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Ansteys 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 Ansteys.