Johanna - surf spot statistics

Johanna in Australia is a powerful and consistent reef break that receives high-quality ground swells year-round, making it a reliable spot for experienced surfers. The swell is almost always present, with ground swells dominating 89-98% of the time—highest from March through September, peaking at 98% in May, September, and October. Wind conditions, however, are far less favorable, with bad winds (onshore or cross-shore) affecting 74-83% of days, meaning clean conditions are rare. The best chance for good winds (offshore) is in autumn (April-May), reaching up to 26% in April. Swell size builds from late autumn through winter, averaging 2.8-3.2m from April to September, with the biggest waves in August (3.2m). Summer (December-February) sees slightly smaller swells (2.4-2.5m) but the worst wind conditions (80-83% unfavorable). The optimal window is April to May, when swell size is solid (2.8-2.9m), ground swells are most consistent (97-98%), and wind conditions are relatively better (25-26% good). Winter (June-August) offers the largest waves (3.0-3.2m) but worse winds, while spring (September-November) remains big but with poor wind odds. Overall, advanced surfers should target mid-autumn for the best balance of swell and wind, accepting that Johanna is more about raw power than perfect conditions.