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Conditions at State's Avenue in December
December: Midwinter Power
December ties for the biggest average swell of the year at 4-5ft (1.2-1.5m), with an average period of 7.1s. The swell rose is broadly mixed: S leads at 9.5%, while SSW, ENE, W, WNW and NNW all contribute meaningful percentages. The favourable ESE/SE/SSE/S window still produces 29% of the observations, and the waves are spread more evenly through the 2-5ft (0.6-1.5m) range than in summer.
Wind is the crown jewel. WNW is the top wind direction at 15.6%, NW totals 13.3% and NNW adds 11.5%, giving an overwhelmingly offshore regime for the SSE-facing beach. Ideal-wind frequency is 28%. Air temperatures average 4.7°C and water temperature drops to 9.3°C, so it is a full winter mission. When a strong nor'easter or large North Atlantic low lines up, December delivers the heaviest, most powerful surf State's Avenue sees all year.
Average Spot conditions at State's Avenue in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at State's Avenue 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 State's Avenue for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at State's Avenue 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 State's Avenue.