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Conditions at Green Island in December
December: Summer Slop Sets In
December is the start of summer proper, and Green Island slips back into the low-quality groove. Average height remains a consistent 1.6m (5ft), but the average period is only 8.0s and ideal wind drops to 36 percent. NE and ENE swells dominate once again, while the ideal ESE through S direction still supplies about 51 percent of the energy - led by SSE at 17.0 percent - so size is rarely the issue. The problem is the wind: offshore N-NW flow is only 19.1 percent, and the trades are strong. Water temperature is 20.5°C, air averages 19.9°C, and rainfall is 2.45 mm/day. A late-afternoon sea breeze and short-period trade swell make it a month for low expectations, except when a rare S swell aligns with fresh NW winds.
Average Spot conditions at Green Island in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Green Island 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 Green Island for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Green Island 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 Green Island.