Predicting the highest temperature for a specific city on a given day is a common niche topic in prediction markets. It carries some novelty for the general public compared to macroeconomics or major political elections.

May 22, 2026 - May 23, 2026, the price of the 19°C option surged from 22c to 35c, the 20°C option surged from 9c to 25c, while the 16°C option plummeted from 14c to 2.5c. The reason is that as the resolution date approaches, short-term weather forecasts have become more certain, meteorological models have converged, and the lower bound of the expected highest temperature has been revised upwards, eliminating the possibility of extremely low temperatures. May 20, 2026 - May 22, 2026, no options experienced a price movement of more than 10 cents.

Predicting the exact lowest temperature of a specific city on a specific day is quite niche and somewhat arbitrary for the general public, though it is a standard weather-related topic within prediction markets.

May 21, 2026 - May 22, 2026, the price of '14°C or below' crashed from 26.5c to 1.5c, and '15°C' dropped from 19c to 5.5c, as updated forecasts ruled out extreme low temperatures closer to the date. May 21, 2026 - May 22, 2026, the price of '17°C' experienced heavy volatility, dropping from 31c to 14.5c before rebounding to 25.5c; '18°C' similarly fell from 31c to 19.5c then recovered to 23c. This was caused by conflicting outputs from different weather models (e.g., GFS vs ECMWF) during this period, causing market expectations to swing between adjacent temperatures.

May 22, 2026 - May 23, 2026: The price of '64°F or higher' surged from 46.5c to 62.5c, and '62-63°F' climbed from 17c to 32.5c. Concurrently, the prices for '60-61°F', '58-59°F', and '56-57°F' plummeted (from 20c to 6.5c, 18c to 3c, and 17.5c to below 1c, respectively). This is due to weather models universally revising upward the expected high temperatures for the weekend as the resolution date approaches, eliminating the likelihood of cooler outcomes.

May 22, 2026 - May 23, 2026, the price of the 23°C option climbed from 22c to 36.5c, while the 22°C option fluctuated, peaking at 35c before settling at 28.5c. This occurred because, as expiration approaches, weather forecasting models have increasingly narrowed the expected high temperature to the 22-23°C range, causing capital to concentrate on these two most likely outcomes. On May 22, 2026, the 21°C option briefly plunged from 14.5c to 4.5c before quickly recovering to 17c. This was likely an anomalous trade caused by low early-session liquidity.

Resolution heavily relies on a specific third-party tracker (xtracker.polymarket.com) and contains nuanced edge cases (e.g., distinguishing main feed replies from normal replies). Furthermore, deleted posts must survive ~5 minutes to be counted, which could lead to discrepancies and disputes between the tracker and manual user observation.

This is a typical novelty/degen market. Under normal circumstances, outside of prediction market participants, virtually no one would bother to track or forecast the exact number of tweets a person makes in a specific 48-hour window.

May 22, 2026 20:28 - May 23, 2026 11:53, the '115-139' option plummeted from 18.5c to 8.5c, as the market experienced a rational pullback after yesterday's overbetting on high-frequency posting, returning expectations to normal levels. May 22, 2026 12:33 - 20:28, the '115-139' option surged from 6.0c to 18.5c, and the '90-114' option surged from 12.5c to 24.5c, while the '40-64' option plummeted from 36.5c to 17.5c. This upward shift in expected weekend tweet volume was likely due to market reaction to recent news events anticipating more frequent posting.