**Official meteorological observations from Argentina’s National Meteorological Service and station networks recorded a daily maximum of 13°C in Buenos Aires on September 7 under clear skies and a lingering cold air mass.** Northeast winds and low humidity kept afternoon readings from climbing higher, aligning with post-frontal conditions after several days of sub-10°C maxima. This data directly supports the market’s near-100% consensus on 13°C. A shift to 14°C would require either a revised station reading, different geographic boundary for the market, or measurement timing discrepancy—scenarios considered highly improbable given the consistency of multiple reports showing peaks no higher than 12.8–13°C.