The market closes one minute before midnight on the penultimate day of the month.
The market will be resolved on the first day of the next month with data from https://www.timeanddate.com/weather/usa/chicago/historic
Ties are possible.
Timeanddate.com has reported 92F for both the 30th and 31st of July. With the current temperature, I will wait until after midnight for the final market resolution
Seems like everyone prior to @aoeuidhtns assumed same integer = tied, and aoeui assumed otherwise.
Given that the 13th happened first, they might just be taking the first instance rather than tiebreaking based on hidden additional precision.
There is a summary table on the website linked in the description that reports a temperature high which appears to pick the earliest date in the case of ties. I assumed that the table is what would be used rather than manually checking each days numbers since the website was referenced for the resolution.
Covering the north, south, east, and west of the continental USA:
In Chicago, on what day will the highest temperature of July 2024 be recorded?
In Austin, on what day will the highest temperature of July 2024 be recorded?
In New York City, on what day will the highest temperature of July 2024 be recorded?
In San Francisco, on what day will the highest temperature of July 2024 be recorded?