The market closes one minute before midnight (EST) on the penultimate day of the month.

The market will be resolved on the first day of the next month, with table data from https://www.timeanddate.com/weather/usa/new-york/historic. Daily market options will be resolved to NO earlier than the end of the month if their temperature has been surpassed.

Ties are possible.

• Update 2026-01-22 (PST) (AI summary of creator comment): In the event of a tie (multiple days sharing the highest temperature), all tied days will resolve to 100% YES.