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Conditions at Sumner Avenue in December
December: Winter Storms Set In
December delivers the largest average swell height of the year at 1.4m (4.6ft), tied with January and March. The average period is 7.1s, so it is still short-period windswell, but the S (9.5%) and SSE (7.0%) swells are punchy and frequent. The wind data is a surfer's dream: WNW (15.6%), NW (13.3%) and NNW (11.5%) are the top three directions, giving a powerful offshore component through the month. Ideal wind conditions clock in at 28%. The combination of winter storm tracks and offshore flow makes for some of the cleanest, most consistent waves of the year. Water temp drops to 8.7°C (48°F), air temps average 4.7°C (40°F), and precipitation averages 3.61 mm/day. The north wind can be brutal, but Sumner Avenue knows how to light up in December.
Average Spot conditions at Sumner Avenue in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Sumner 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 Sumner Avenue for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sumner 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 Sumner Avenue.