Chicago weather forecast API: live temperature nowcast and daily high forecast for Chicago Midway (KMDW), with calibrated probability the temperature ends above/below any Fahrenheit strike. KMDW is the official settlement station for Kalshi KXHIGHCHI and Polymarket Chicago daily high temperature prediction markets. Built for AI agents trading weather prediction markets or needing real-time weather data. $0.05 with live 3h thermal-memory telemetry (out-of-sample nowcast RMSE 0.95F); $0.01 degraded fallback (RMSE 1.11F). Free catalog: https://runwayoracle.com/catalog.json. Model-conditional estimates; not financial advice.

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