Trader consensus on an 80-81°F low for Miami on June 17 stems primarily from National Weather Service observations at Miami International Airport (KMIA), where overnight minimums aligned with mid-June climatological norms of 77-83°F under typical subtropical high-pressure conditions and light winds. Sea-breeze moderation and high humidity prevented significant radiational cooling, keeping the reading firmly within the dominant bracket despite minor model variability in prior forecasts. This outcome reflects aggregated trader assessment of official station data rather than broader regional averages. A shift to 78-79°F or below would require an atypical cold-air intrusion or revised station report, scenarios with low historical precedent in early summer.