Will a major U.S. city set a new high-temperature record during the June 28–July 4, 2026 heatwave?

🤖 Context

This market will resolve to YES if any major U.S. city records a higher temperature between June 28 and July 4, 2026, than its previous all-time high. The outcome will be determined based on official meteorological records from the National Weather Service or equivalent authoritative sources.