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Conditions at Sebastian Inlet in December
December: Cold Fronts and Consistency
December locks in winter consistency. Swell averages around 3ft (0.9m), period is 8.6s, and favorable wind is back up to 30%. The wave rose shows ENE (24.2%), E (23.4%) and NE (15.3%), with meaningful NNE and NNW energy as well - a sign that Nor'easters and frontal lows are firing on all cylinders. Heights in the 3-5ft (1-1.5m) range are common, and the larger 5-6.5ft (1.5-2m) class is present enough to keep things exciting. The wind rose also turns more favorable compared with autumn: NNW (12.8%), NW (8.8%) and WNW (6.6%) are common post-frontal directions, while winter contributions from W/SW are enough to give 30% clean-wind days. That is a recipe for solid surf: NE/ENE groundswell groomed by offshore and cross-offshore wind.
Air temps drop to 19.1°C, water to 22.8°C, and rainfall is low at 2.09 mm/day. December is a reliable, high-quality month for East-Central Florida surf.
Average Spot conditions at Sebastian Inlet in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Sebastian Inlet 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 Sebastian Inlet for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sebastian Inlet 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 Sebastian Inlet.