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Conditions at Dee Why Point in December
December: Summer Lull and Sea-Breeze Roulette
December is statistically the smallest wave month of the year at Dee Why Point, with the average swell height dropping to 5ft (1.5m) and the average period tied at 8.3s. The NE, ENE, E and ESE swell directions remain plentiful, occasionally producing fun, summer-style waves. The problem is the wind: NE and ENE winds combine for over 25% of all observations, driving onshore conditions and bumping up the surface. The ideal wind percentage falls to just 17%, leaving only the early mornings and the rare SW/W change as legitimate clean windows.
Water warms to 21.5°C, air temperatures average 21.2°C, and rainfall sits at 2.43 mm/day. December is summer mode in full effect-manage expectations, pick the dawn patrol, and enjoy the warm water between sea-breeze battles.
Average Spot conditions at Dee Why Point in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Dee Why Point 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 Dee Why Point for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Dee Why Point 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 Dee Why Point.