Conditions at Gruissan in December
December: Winter's Consistent Peak
December ties for the highest ideal wind percentage of the year at 26% and holds the average swell at a solid 3-4ft (0.9-1.2m) with a 5.4s period. The wave rose continues to be dominated by WNW/NW windsea, but the E/ESE/SE/SSE swell group remains present at 27% and carries some of the more interesting larger waves, particularly from ESE and SSE. In December, high pressure over the continent and low pressure in the Mediterranean produce the classic winter coupling: a cold NW tramontane blowing offshore while E/SE swell pulses hit the coast. Average air temperature drops to 8.9°C, water temp to 14.0°C, so thick neoprene is non-negotiable. Precipitation is moderate at 1.64 mm/day. Gruissan is not about giant waves, but for consistency, December is as good as it gets.
Average Spot conditions at Gruissan in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Gruissan 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 Gruissan for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Gruissan 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 Gruissan.