Verified observations from the National Weather Service at Austin-Bergstrom International Airport (KAUS)—Polymarket's official resolution source via Weather Underground—confirm the highest temperature on April 16 reached 88-89°F around mid-afternoon, solidifying trader consensus at 100% implied probability for this outcome with substantial volume backing the positioning. Preceding NOAA and ECMWF model runs converged on upper-80s peaks under a high-pressure ridge fostering southerly flow, low humidity, and clear skies ahead of a weekend cold front, aligning with mid-April climatology where average highs hover near 80°F amid frequent warm anomalies. While robust across ASOS stations, rare challenges like post-audit data corrections for sensor issues could theoretically shift resolution, though historical precedents show such revisions under 1% likelihood.