The title asks for Seoul's highest temperature, but the rules explicitly state that resolution is based on the 'Incheon Intl Airport Station (RKSI)'. Temperatures at Incheon Airport (coastal) often differ from central Seoul, creating a trap for traders relying on generic Seoul forecasts. Additionally, temperatures are evaluated in whole degrees Celsius without accounting for later revisions.

From 2026-04-19 11:08 to 2026-04-20 08:48, the price of the 18°C or higher option plummeted further from 22.5c to 12c, as weather forecasting models confirmed that the maximum temperature would fall into a lower range (around 15°C) as the target date approached. From 2026-04-19 04:38 to 2026-04-19 07:53, the price of the 18°C or higher option dropped from 32c to 27.5c, and the 16°C option rose from 17c to 27c. This was due to updated short-term weather forecasts ruling out the possibility of anomalous high temperatures, narrowing the expected range to around 15-16°C.

The title refers broadly to Sao Paulo, but the rules strictly limit resolution to a specific station at Guarulhos International Airport (SBGR) using Wunderground's whole-degree Celsius data. Furthermore, the stated settlement time (12:00 on April 21) physically contradicts the rule requiring all daily data to be finalized, meaning actual settlement will inevitably be delayed to the following day.

Predicting the exact daily high temperature of a specific city is a standard daily weather market on prediction platforms. However, it remains a novel and niche concept for the general public, who rarely consider or bet on such hyper-specific meteorological data points.

April 19, 2026 - April 20, 2026, the price of the 26°C option gradually climbed from 23.5c to 38.5c, an increase of 15c, because as the target date approached, weather models narrowed their forecast ranges, confirming that the high temperature will likely be around 26°C. April 19, 2026 - April 20, 2026, the price of the 24°C option plummeted from 10.5c to 4.15c, as updated forecasts ruled out the possibility of unseasonably low temperatures.

April 19, 2026 - April 20, 2026, the price of the 14°C option rose from 30c to a peak of 50.5c (currently at 47c). This occurred because, as the resolution date approaches, the latest weather forecasts consistently point to a high of 14°C, significantly boosting market confidence in this specific temperature range.

The title broadly states 'Buenos Aires', but the resolution strictly relies on the 'Minister Pistarini Intl Airport Station (SAEZ)'. The airport is outside the urban heat island, meaning temperatures can differ significantly from the city center. Additionally, relying on Wunderground's whole-degree Celsius data could pose minor rounding risks.

From 2026-04-19 17:38:18 to 2026-04-19 19:48:18, the price of '23°C or higher' surged from 32.5c to 51.5c, likely due to updated weather models predicting higher maximum temperatures for that day. From 2026-04-19 19:48:18 to 2026-04-19 21:58:18, the price of '23°C or higher' dropped back from 51.5c to 37.5c as the market adjusted its expectations, recognizing that 22°C or 21°C still hold significant probability.