Good Rats - surf spot statistics

Best Surf Season (November - March)

The North Atlantic roars to life during these months, delivering the most consistent and powerful swell to Good Rats. Average wave heights range from 2.5m to 3.0m with long periods averaging 11-12 seconds, thanks to a steady parade of extratropical cyclones tracking across the basin. Swell directions are dominated by the optimal WSW, SW, and SSW, perfectly aligned with the beach's SW exposure. Offshore winds from the NE and ENE quadrant blow a higher percentage of the time, especially from December through February, when the polar jet stream strengthens and the NAO often dips negative, driving storm tracks closer to the coast. This combo produces clean, grinding, long-period surf that can hold a board comfortably. The main challenge is the occasional onshore flow from the SE and S when high-pressure systems set up to the east, but overall, this is prime time for the spot.

Fair Surf Season (April & October)

These shoulder months offer a transition between the winter peak and summer lull. April still sees respectable average wave heights of 2.2m and periods around 10.8s, with a high percentage of ideal wind (39%) – the highest of any month. However, the swell becomes more inconsistent as the storm track shifts north. October sees a resurgence with 2.5m average height and 10.4s period, but the wind ideal rate drops to 29%, meaning more variable conditions. Both months benefit from a mix of groundswell and windswell, and with the right setup – a low pressure passing to the north and a cold front clearing out – you can score fun, punchy surf with clean offshore breezes.

Low Surf Season (May - September)

Summer settles in, and Good Rats goes into a slumber. Average wave heights drop to 1.3-1.7m, with periods shrinking to 9-10 seconds. Swell still comes from the preferred SSW-SW-WSW directions, but the energy is often weak and short-period, producing mostly small, mushy, or choppy waves. The biggest enemy is the wind: onshore flow from the SSW, SW, and WSW becomes predominant, especially from June through August, when ideal wind percentages bottom out at 19-24%. Afternoon seabreezes further degrade conditions. A stray tropical storm or cloud-to-ground hurricane swell can briefly light things up in September, but consistency is low. For the dedicated surfer, a groveler or longboard is the board of choice on the rare clean dawn patrol with a light offshore breeze from the north or east.

April: Transitional Gold Mine

April marks a shift, but don't sleep on it. The average swell height drops to 2.2m, but the period remains solid at 10.8s – still plenty of punch for a wide range of boards. Swell directions still target the sweet spot: SW (22.4%) leads the pack, followed by WSW (18.4%) and SSW (13.6%). Interestingly, the ideal wind percentage jumps to 39% – the highest reading of the entire year! Offshore flow from NE (6.4%), ENE (8.2%), and E (7.4%) is still common, but SE (12.0%) and SSE (11.1%) onshore winds are also prominent. April's unique character lies in the transition: the jet stream begins to retreat northward, but lingering coastal storms can still produce excellent surf. When a low pressure system brushes the coast and is followed by a high-pressure wedge, you get clean, slightly cooler conditions with waist- to chest-high waves that are rippable and fun. A good month for those who crave quality over quantity.