**Trader consensus strongly favors a 50-51°F low in San Francisco on October 12, 2026, with 91.5% implied probability, reflecting the official National Weather Service minimum of 50°F recorded at 5:47 AM at San Francisco International Airport.** This reading fell 4°F below the 1991-2020 normal of 54°F amid clear, dry conditions and light winds that promoted efficient overnight radiational cooling. Recent days showed a cooling trend, with the prior night's low near 51°F and no precipitation to moderate temperatures. Historical October 12 lows average near 55°F, making this event notably cooler yet within the typical range of variability. Scenarios that could challenge resolution include minor differences between airport and downtown stations or post-observation quality-control adjustments, though such shifts remain unlikely given the consistent preliminary reports.