Conditions at 7 - 11 in December
December: Offshore Winds and Winter Swell
December delivers the most favorable wind climate of the year at 7-11, with ideal conditions 49% of the time. The W/WNW/NW/NNW offshore flow is dominant at around 51% of all wind directions, making cold, glassy lineup conditions more consistent than any other month. Average surf height reaches 1.2m (4ft) and period runs 7.3s, keeping the waves punchy and rippable as winter lows spin up over the Atlantic.
The swell direction is a little more mixed in December, with solid E/SSE/S components all contributing. When a coastal low forms along the Gulf Stream or a nor'easter brushes the coast, expect 4-6ft (1.2-1.8m) sets with clean, offshore-stacked conditions. Air temps drop to 4.7°C and water cools to 8.7°C, so winter rubber is back on. Precipitation is frequent at 3.61mm/day, but December's high percentage of offshore wind means the best days often come right after a cold front passage clears the sky and leaves groomed swell behind.
Average Spot conditions at 7 - 11 in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at 7 - 11 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 7 - 11 for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at 7 - 11 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 7 - 11.