National Weather Service forecasts and real-time observations confirm that Chicago will reach a daytime high well above 56°F on May 16, driven by a stable high-pressure ridge and southerly flow transporting milder air from the Gulf region. Mid-May climatology places average highs near 70°F, and current model runs show no significant cooling mechanism capable of keeping temperatures below the threshold. Morning readings already climbing through the 50s further support the market's unanimous trader consensus. The sole realistic scenario that could alter this outcome would require an unforecasted frontal passage or anomalous cold advection, conditions current ensemble guidance assigns near-zero probability before sunset.