The market's decisive consensus on a 66-67°F daily high for San Francisco on June 4 reflects official National Weather Service observations that placed the peak temperature squarely in this narrow range. Early June marine-layer stratus combined with steady onshore flow from the Pacific kept maximum readings moderate, consistent with the city's climatological baseline where highs typically hover between 60°F and 70°F. Multiple local stations and short-range forecast models converged on this outcome in the days leading up to the date, leaving little room for deviation. While post-event data revisions remain theoretically possible, the alignment of independent measurements makes any shift outside the 66-67°F bin highly unlikely.