The market's 100% consensus on the 76-77°F bin is anchored in the National Weather Service's official climatological report from San Francisco International Airport, which recorded a maximum of 77°F on September 30 under partly sunny conditions with a strengthening marine layer and northwest winds. This outcome aligns with typical late-September patterns influenced by coastal upwelling and the Pacific high, where highs average near 71°F but can reach the mid-70s during brief warming episodes before fog returns. Nearby stations reported similar values around 77-78°F, confirming the bin resolution with minimal model or observational uncertainty. Scenarios that could have altered positioning, such as stronger onshore flow or earlier marine layer intrusion, did not materialize based on final observations.