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Conditions at The Alley in December
December: Summer Trade-Wind Mayhem
December brings the full return of the summer trade-wind regime. Average swell height is 1.0m (3.3ft), period sits at 7.5s, and ideal wind percentages stay low at 24 percent. Interestingly, the swell direction is extremely favourable, with ENE (20.0%), E (28.4%), NE (11.8%), and ESE (18.7%), so the beach is full of 2-4ft (0.6-1.2m) lines. But the wind rose is ugly: NNW (19.2%), NNE (9.7%), SSE (11.3%), and SE (10.5%) dominate, making conditions cross-onshore and lumpy for most of the month. Air temps average 24.0°C, water temps are 24.0°C, and rainfall increases to 4.42 mm/day. The Alley can still fire in December when a tropical cyclone offshore or a deep inland trough drags a W/SW wind change across the coast; otherwise, you're surfing on-shores in warm, humid chaos.
Average Spot conditions at The Alley in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at The Alley 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 The Alley for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at The Alley 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 The Alley.