- Home
- ...Australia
Australia- Johanna
Conditions at Johanna in December
December: The Mellow Before the Storm
December brings the official arrival of summer and the quietest average conditions of the year. Swell height averages 7-8ft (2.3m), period eases to 11.7s, and the SW direction is still the clear driver - SW 35.5%, WSW 13.1%, SSW 9.9%, S 2.8%. Most of the energy sits in the 1.5-2.5m (5-8ft) range, with a much smaller 8ft+ presence. The waves can still be fantastic, especially when a late-season frontal system pushes SW groundswell up from the Southern Ocean.
But the wind is the limiting factor. Ideal conditions are at their annual low of 22%, the N through ENE offshore quadrant is only about 12% of the wind rose, and the afternoon seabreeze cycle is well established, bringing S/SW and SW winds that blow straight into the beach. Water temp is 16.4°C and rising, average air temp is 15.1°C with highs into the high 20s, and rainfall is low at 1.89 mm/day. Go early, go small, and enjoy the mellow summer energy.
Average Spot conditions at Johanna in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Johanna 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 Johanna for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Johanna 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 Johanna.