Moruya Breakwall • Statistics for December

December: Summer Energy and the Trade-Wind Gamble

December closes the year much as it starts: plenty of east swell and too much onshore wind. Average height holds around 4ft (1.2m), but the period stays short at 8.0s and ideal wind sinks to 18 percent - among the lowest of the year. The swell rose is loaded with ENE (23 percent), E (17 percent), ESE (16 percent), plus NE (6 percent), so Moruya's wave window is almost always doing something. The catch is the prevailing NNE-NE flow: the bad NE-ENE-E-ESE wind sector is around 28 percent, while the SW-WNW offshore quadrant is just 6 percent. Afternoons are typically choppy and windblown, with a lumpy short-period wave rather than a clean breakwall line. Water temp is up to 19.6°C and air averages 19.1°C, with 2.55 mm/day of rain. Chasing early-morning westerlies or a passing coastal trough is the only way to unlock December's potential; otherwise it's a summer beach day more than a surf day.