**Developing El Niño conditions and above-average September temperatures are the dominant factors keeping early snowfall probabilities low for major northern cities.** NOAA and the Climate Prediction Center indicate a strengthening El Niño, with Niño 3.4 anomalies already elevated and models favoring a significant or super event peaking later in the season; this pattern typically shifts the Pacific jet stream and favors warmer, drier conditions across the northern U.S. in early fall. Current NWS forecasts for early September show daytime highs in the upper 70s to mid-80s across Chicago, New York City, Detroit, and St. Louis, with only rain chances and no freezing levels or accumulating snow expected. Historical climatology places median first measurable snowfall (≥0.1 inch per NWS) in these areas between mid-November and mid-December. Traders are therefore focused on later timing and relative city advantages, such as Chicago’s lake-effect potential versus inland or coastal sites. Key upcoming catalysts include updated CPC seasonal outlooks, weekly NWS temperature and precipitation forecasts, and any early cold-air intrusions that could shift model consensus.