Caldera seasonal overview
Best Surf Season (May - October)
Caldera sits exposed to a WSW-facing swell window, and the directional data could hardly be more consistent: SSW swell is the dominant signal every single month of the year. During May through October, the average wave period climbs to 14.0-14.5s, placing most swell in the 'powerful, long period' bracket, and the combination of SSW/SW directions is at its most persistent. This is the closest thing to a best season in statistical terms. However, there is a massive catch: average swell height never escapes the 0.7-1ft (0.2-0.3m) range, and only a tiny fraction of the distribution ever reaches 2-3ft (0.5-1m). The ITCZ is also parked overhead during these months, bringing rain and a wind regime that is often onshore from the south, so surface conditions tend to be lumpy. Still, when a long-period SSW pulse lines up with a light offshore morning, the potential is there for small, clean, longboard-friendly waves.
Fair Surf Season (November - April)
November through April is the dry season and the trade-wind recovery period at Caldera. The northeast trades blow offshore from the NNE/NE/ENE/E quadrant with much greater frequency, which is exactly what an WSW-facing beach needs for clean surface texture. The trade-off is that the average swell periods are a bit shorter, especially in December and January (10.9-12.1s), and the average height remains stuck around 1ft (0.3m). This is the fair season because the surf is generally tidier, mornings can be glassy, and the beach is far more pleasant with less rain. But in terms of actual wave size, it is still marginal at best. The archive shows zero percent ideal wind time in every month, so even the fair season requires patience and a realistic expectation of knee-high conditions.
Low Surf Season (Year-Round, Especially December - February)
The blunt truth is that Caldera is in a year-round low surf season from a statistical standpoint. No month records an average swell height above 1ft (0.3m), and the amount of swell reaching the 2-3ft (0.5-1m) 'fun-sized' category never exceeds about 1% of the monthly distribution. The lowest energy windows are December through February, when average height drops to around 0.7ft (0.2m) and periods shorten to 10.9-12.1s. The ocean is still beautiful, warm and full of directional consistency from SSW, but real surfable energy is almost always absent. Plan for a groveler, a longboard and low expectations; the rare bigger SSW groundswell that coincides with an offshore wind event is the exception worth chasing.