Pipeline is a world-class reef break that thrives on powerful, clean ground swells and favorable winds. The best months for surfing at Pipeline are typically from November to February, when ground swell dominates (76-91% of the time) with a mean swell size of 1.7-2.4m, providing the consistent, heavy barrels the spot is famous for. December stands out with a strong balance of 85% ground swells, 2.0m average size, and relatively better wind conditions (47% good winds). January and February also deliver excellent swell (2.3-2.4m, 88-91% ground swells), though winds are less favorable (only 28-29% good conditions). The winter months often produce the biggest and cleanest waves, but offshore winds are infrequent, so patience is key. October and March can still offer solid sessions with decent ground swells (70-72%), though swell size drops slightly (1.5-1.8m). April to September sees a significant decline in quality, with increasing wind swell influence and smaller waves (1.1-1.5m), though July-September have slightly better wind conditions (39-50% good winds). For expert surfers chasing the best barrels, the core winter window (November-February) is prime time, despite the challenging winds, while shoulder months like October or March may provide fewer crowds and occasional clean days. Summer months are generally inconsistent and better suited for less demanding sessions.