Seattle experiences highly variable spring weather, with April temperatures frequently ranging from the 30s to 60s Fahrenheit depending on arriving cold fronts and warming systems. The April 18 forecast for a high of 40-41°F represents a cool but not unusual day for early spring in the Pacific Northwest region. This specific temperature range has been a recurring weather prediction market, allowing traders to analyze historical patterns and compare forecast models from multiple meteorological services. The current market odds of 0% suggest the crowd views this temperature range as unlikely for April 18, indicating either warmer or cooler conditions are being priced in more strongly. This could mean forecasts are trending toward either above-41°F highs or below-40°F lows. Weather markets typically resolve based on official National Weather Service data for Seattle-Tacoma International Airport (SEA), providing transparent and verifiable outcomes independent of subjective interpretation. The market's $13K liquidity and recent $2.8K trading volume indicate moderate participation, with traders potentially hedging against weather-dependent activities like outdoor events or energy usage predictions. Observing how these odds shift as April 18 approaches provides valuable insight into how confidence in longer-range weather forecasts changes over time.