**Trader consensus for a 1°C-or-below minimum on September 7, 2026, in Buenos Aires rests on verified observational data from the day itself.** Clear skies and a strong influx of cold polar air produced rapid nighttime radiative cooling, with official and local reports recording a minimum of 1°C in the greater Buenos Aires area and even lower readings (down to –6°C) in surrounding rural zones of northern Buenos Aires province. These measurements align with National Weather Service and regional monitoring station data, leaving negligible room for higher outcomes. The only realistic scenarios that could have altered the result—such as unexpected cloud cover reducing radiative cooling or a last-minute warm-air intrusion—did not materialize, locking in the market-implied outcome at essentially 100%.