Yallingup • Statistics for December

December: Summer Light, Early Windows and Reef Time

December closes the year with classic summer conditions. Average swell height remains around 6ft (1.9m) and period is 11.9s, while the directional spread is dominated by SSW at 28.3 percent and SW at 40.6 percent, with only 8 percent coming from WSW and barely any W/WNW. It is not a month of huge north-west groundswell; instead, Yallingup relies on lower-latitude storms and refracted SW swell to keep the reefs alive. Expect playful, fun-sized waves most days, with occasional 6-8ft (1.8-2.5m) sets when a stronger front pushes through.

Winds are mostly from the southeast quadrant, with ESE/SE/SSE total around 44 percent, giving Yallingup clean morning conditions before the summer seabreeze arrives. The ideal wind window is only 16 percent, the joint-lowest of the year, due to strong S/SW afternoon breezes. Air temperatures are warm at 19.2 degrees C (min 12.8, max 28.6), water temperature is 19.9 degrees C, and precipitation drops to a dry 0.42mm/day. December is best approached with low expectations and a dawn patrol mindset.