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Conditions at Perranporth in December
December: Peak Winter, Heavy Swells and the Festive Storm Train
December delivers some of the heaviest, most sustained surf of the year at Perranporth. Average swell heights jump back to 7ft (2.1m) and the average period runs a strong 11.7s, with W and WSW swells producing a high percentage of 1.5-2.5m (5-8ft) waves and a sprinkling of 2.5m-plus energy. The dominant W direction still leads the way at 30.7%, with WSW 13.1% and WNW 10.4%, giving the beach plenty of directly exposed, hard-hitting swell. Wind is the biggest wildcard: the onshore westerly sector is often active, and offshore flow remains just 18% of the time. However, winter high-pressure ridging over the continent can send cold, dry east winds over the coast - exactly what Perranporth needs to turn an unruly storm swell into groomed, offshore perfection. With air temperatures averaging 8.7°C, water temps falling to 11.1°C and precipitation at 4.15mm/day, this is the raw, committed end of surf season in the UK.
Average Spot conditions at Perranporth in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Perranporth 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 Perranporth for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Perranporth 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 Perranporth.