Persistent subtropical high pressure and typical late-July maritime tropical air mass maintained overnight radiative cooling rates near normal for Miami International Airport, producing a minimum temperature of 80–81°F as confirmed by National Weather Service observations. This aligns with the 1991–2020 climatological average low near 78–80°F and recent ensemble guidance showing minimal deviation from seasonal baselines. Trader consensus at 100% reflects the absence of any synoptic cooling mechanisms such as frontal passages or enhanced cloud cover that could have lowered readings below the 80°F threshold. A realistic challenge would require an unforecasted influx of drier continental air or significant measurement revision by official reporting agencies, though such events remain historically rare in South Florida during peak summer.