San Francisco experiences mild, temperate spring weather in April, with typical daily high temperatures ranging from 60 to 72°F. April 20 falls at the tail end of spring as the city transitions toward warmer summer patterns. A high temperature of 74°F or above would represent warmer-than-average conditions for the period, though such days are not uncommon, particularly with afternoon clearing, strong solar radiation, and light marine winds from the Pacific. The current market pricing reflects very low probability for this outcome, with YES odds at 0%, suggesting traders anticipate cooler or typical spring weather patterns to dominate the forecast. This market resolves based on official National Weather Service temperature readings for San Francisco (downtown or equivalent verified source), making it a completely verifiable short-term weather prediction trade. The complete absence of buy-side interest in the YES outcome indicates strong confidence among market participants that the threshold will not be met. The odds trajectory shows no meaningful price movement, reflecting consensus among traders around lower-temperature expectations for the date.