Conditions at Avalon in December
December: Mid-Summer Peaks and the Onshore Grind
December is statistically one of the weakest months at Avalon. Ideal wind sits at just 23%, the average wave period bottoms out at 8.1s, and the average swell height is 1.3m (4.3ft). The wave rose shows a wide E/SE spread, with ENE 19%, E 18%, ESE 16%, SE 18% and SSE 20%, but much of this energy is generated locally rather than by distant storms. Combined with dominant NE/ENE winds, a strong SSE/S component, and the summer afternoon sea breeze, the result is often bumpy, short-period surf. That said, the low season is not without hope. Long-range E/SE swell from the tropical South Pacific can still arrive, and when a rare W/NW offshore wind aligns with one of those pulses, Avalon can offer clean, shoulder-to-head-high waves. Water temp is a warm 21.1°C, air temp averages 21.6°C, and rain averages 2.68 mm/day. Surf early, keep expectations realistic and wait for the wind to swing west.
Average Spot conditions at Avalon in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Avalon 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 Avalon for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Avalon 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 Avalon.