Recent National Weather Service forecasts and ensemble model guidance indicate overnight lows in the mid- to upper 50s Fahrenheit for Chicago on October 7, supported by a warm southwesterly flow and clear to partly cloudy skies that limit radiational cooling. This setup places the expected daily minimum several degrees above the 1991–2020 climatological average of roughly 50°F, prompting traders to assign the highest implied probability (49%) to the 66°F-or-higher outcome while clustering substantial volume across the 48–65°F range. Short-term model consensus remains stable, though minor shifts in cloud cover or wind could adjust the minimum by a few degrees before the calendar day ends; the next NWS forecast discussion and updated high-resolution runs will provide the primary near-term catalysts for any repricing.