**Trader consensus at 100% for a 25°C high on June 13 reflects official meteorological observations confirming that exact maximum in Mexico City.** June conditions in the high-elevation Valley of Mexico typically produce daytime peaks near 24–25°C under the influence of subtropical high pressure and partial cloud cover, with minimal deviation from climatological averages this period. Recent model runs and surface station data aligned closely with these norms, showing no anomalous warming from advection or reduced cloudiness that could elevate readings. The market's near-certainty incorporates the low probability of post-observation revisions, as national weather services apply standardized quality controls to daily maxima. A realistic challenge would require either a corrected station report exceeding 25°C or a definitional dispute over the precise observation window, though such adjustments are rare once preliminary data are released.