Current National Weather Service guidance and ensemble model consensus point to an overnight low in the mid-60s for New York City on May 18, driven by a warm, moist air mass and limited radiative cooling under partly cloudy skies. This setup explains the market’s heaviest volume on the 66-67 °F bin, followed closely by the 64-65 °F and 68-69 °F ranges, reflecting modest uncertainty in exact minimum timing and urban heat-island effects at Central Park. Key variables include wind speed overnight, which could enhance mixing and raise the low, versus clearer skies that might allow further cooling toward the mid-60s. Historical mid-May climatology places the normal low near 53 °F, underscoring how this warm anomaly has shifted trader sentiment toward the upper bins ahead of tomorrow’s final observations.