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Conditions at Cronulla in December
December: High Summer Grind
December completes the swing into the low-quality summer pattern. Average wave heights dip to around 5ft (1.5m), the lowest of the year, and the average period is 8.3 seconds. NE, ENE, E, ESE and SE swells dominate, with S/SSE groundswell fading. Many of these waves are produced by local trade-wind seas and weaker frontal activity well to the south, so they lack the power of winter.
Wind is the weak link. Ideal offshore wind is only 15%, while NE and NNE winds are the two most frequent directions. The NE sea breeze is relentless, creating onshore, bumpy conditions by midday. Still, December has warm water at 21.1°C, air temps averaging 21.2°C, and long daylight hours. The best time to surf is at first light, before the seabreeze switches on, when those ENE/ESE trade swell lines can still deliver clean, rippable 3-5ft (1-1.5m) waves.
Average Spot conditions at Cronulla in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Cronulla 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 Cronulla for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Cronulla 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 Cronulla.