The Atlantic hurricane season's official June 1 start date, combined with the passage of May 31 without any tropical cyclone reaching sustained 74 mph winds, underpins the 100% market-implied probability for no formation. Climatological data from NOAA show that main development region sea surface temperatures typically remain below the 26.5°C threshold for rapid intensification during May, while stronger vertical wind shear and drier mid-level air suppress organization. Historical records confirm only a handful of pre-June hurricanes in the basin over decades, with none occurring in recent years. No new model runs or observations altered this outlook before the cutoff, though an atypical early warm pool or steering pattern shift could theoretically enable rare formation in future seasons.