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Conditions at Gnaraloo in December
December: Summer Lull Sets In
December closes the year with a classic summer lull. Average wave period is back down to 11.1s, wave height is a modest 4-5ft (1.2-1.4m), and ideal wind windows bottom out at 9%. SSW and SW swells dominate around 95% of the time, but many of those waves are average-period, directionally challenging pulses that struggle to light up the NW-facing beach. Strong S and SSW winds dominate the wind rose-30.9% and 37.3% respectively-and with air temps of 27.9°C and water at 24.0°C, summer is fully in control. Unless a tropical low drifts close enough to inject an ultra-rare N/NW swell, December is about warm-water, seasonal-size waves rather than epic Gnaraloo conditions.
Average Spot conditions at Gnaraloo in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Gnaraloo 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 Gnaraloo for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Gnaraloo 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 Gnaraloo.