Conditions at Yerbabuena in December
December: Winter Prime Time
December is one of the most reliable months for big Atlantic surf at Yerbabuena. Average swell height is 4.6ft (1.4m) with a powerful 11.0s period, and the storm track is firing on all cylinders. The wave rose sees WNW at 40.8%, W at 16.4% and E windswell at 10.1%, while S/SSW/SW swell reaches its highest combined share of the year at 2.3%. This is the month when the southwest-facing beach can get hit by both refracting North Atlantic groundswell and the more direct S/SW groundswell from fast-moving lows, the recipe for really good surfing.
The wind is also on side, with ideal offshore conditions 40% of the time. NNW at 12.7% and NW at 8.6% are strong players, while E/ESE flow, although still common at 31.2%, sees more competition from the north. Water temperature is 16.7°C, air 15.8°C, and precipitation peaks at 3.39mm/day. December is the heart of winter surf; expect solid waves, sweeping Atlantic swells and a few memorable sessions if you pick the right winds.
Average Spot conditions at Yerbabuena in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Yerbabuena 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 Yerbabuena for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Yerbabuena 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 Yerbabuena.