The near-certain 98.3% market-implied probability that no hurricane will form by May 31 stems from the Atlantic basin's official June 1 start to hurricane season combined with persistently unfavorable early-season conditions. As of mid-May, National Hurricane Center monitoring shows no organized tropical systems, with sea-surface temperatures still below the typical 26.5°C threshold needed for rapid intensification and elevated wind shear suppressing development across the main development region. Historical records confirm only a handful of May hurricanes since 1851, most forming late in the month under anomalous warmth. Traders are therefore assigning negligible odds to an out-of-season event, though a realistic wildcard remains an unexpected tropical wave organizing rapidly in the Gulf of Mexico or western Caribbean over the final two weeks if steering patterns and shear suddenly relax.