Recent National Weather Service and model guidance indicate a cooler-than-normal air mass over the Chicago area on May 22, with forecast highs centered in the low-to-mid 60s Fahrenheit following the passage of a cold front. This setup, featuring northeasterly flow and limited daytime heating, keeps the 64–65 °F and 66 °F-or-higher bins closely matched while limiting the probability of reaching the long-term normal near 73 °F. Ensemble spreads show modest uncertainty tied to exact cloud cover and wind speeds, with newer runs offering only incremental warming potential; traders are therefore weighting current observational trends and the next 12–18 hours of model updates most heavily when assessing resolution near the 60–66 °F threshold.