The closely matched 49.5% implied probabilities on 63°F or below versus 82°F or higher for New York City’s May 20 low reflect substantial uncertainty in extended-range temperature forecasts. Springtime conditions in the Northeast feature high day-to-day variability driven by shifting jet-stream positions and competing influences from warm Atlantic sea-surface temperatures and lingering cool-air outbreaks. Ensemble spreads in NOAA’s GFS and ECMWF models remain wide for the period, with different solutions hinging on the exact timing of any frontal passages or high-pressure building. Traders are therefore weighting the full historical distribution of mid-May minimums rather than converging on a single outcome, pending the next operational model cycles that will narrow the range of possible temperatures.