Helsinki's weather in mid-April remains cool as spring develops across northern Europe. April 20 represents a time when Finland's capital transitions between winter and spring conditions, with average daily highs typically around 10-12°C. A high temperature of 16°C or higher would represent notably warm conditions for this calendar date in Helsinki's climate. The current market odds of 3% for YES reflect traders' assessment that such warmth is unlikely given typical spring weather patterns. Helsinki's spring season is known for variability, with occasional warm days punctuated by cooler periods. The low probability implied by the odds suggests market participants expect conditions to follow the seasonal norm rather than experience an unusual warm spell. This market resolves based on the official highest temperature recorded in Helsinki on April 20 by the Finnish Meteorological Institute. The resolution criteria is straightforward and verifiable through public weather data. The market reflects whether an unusual warm day will occur or whether typical cool spring conditions will prevail in Finland's capital. The price reflects skepticism that temperatures will climb to 16°C or above on this specific date.