San Francisco's April weather typically ranges from 58 to 68°F, with average highs around 65°F. This market tracks whether the city's highest temperature on April 18, 2026, will fall between 62 and 63 degrees Fahrenheit—a cooler-than-average scenario for mid-April. The outcome resolves based on official National Weather Service data recorded at San Francisco International Airport, making it objective and verifiable. Current trading odds at 2% reflect the low probability of this narrow temperature band occurring on this specific date. While April can bring variable conditions to the Bay Area, from cool mornings to warm afternoons, hitting this exact 1-degree range is uncommon. Historical weather patterns suggest April 18 temperatures more often fall between 64-68°F during this period. The odds trajectory shows traders believe warmer conditions are significantly more likely than this specific range. This market illustrates how prediction markets price precision: broader temperature ranges trade at higher odds, while narrow 1-degree bands remain low-probability positions that reward accurate forecasting. Traders use these markets to hedge weather-dependent activities or explore the probability distribution of temperature outcomes across the calendar.