New York City weather on May 18 will be determined by the interplay of spring jet stream positioning, Atlantic weather systems, and urban heat effects. The question asks whether the daily high—measured by the National Weather Service at Central Park—will land precisely between 72 and 73 degrees Fahrenheit. This narrow eight-degree band is remarkably specific: in May, NYC typically sees highs between 65 and 80 degrees Fahrenheit, depending on which weather system dominates. The 1% odds reflect the market's assessment that such precision is extraordinarily unlikely. Traders interpret this low probability as a reflection of the difficulty in predicting such a tight temperature range even one day ahead. Most forecasts acknowledge uncertainty bands of ±3 to ±5 degrees, making an exact eight-degree range exceptional. The odds have likely remained low throughout this market's trading history because historical frequency of temperatures in this exact band on random May dates is itself quite rare.
What factors could move this market?
New York City's weather in mid-May emerges from the complex interplay of jet stream positioning, Atlantic storm systems, and the urban heat island effect. By late May, the city transitions from spring to early summer, but May 18 typically sits in a transitional zone where daily highs can vary from the mid-60s to the low 80s depending on which air mass dominates. The 72-73 degree range in this market represents the cooler end of a typical May expectation, consistent with a day influenced by a passing cold front, lingering maritime air, or cloud cover from a weather system. Historically, New York City experiences days with highs in this range during May, but pinpointing the exact eight-degree window in advance is considerably more difficult than reviewing past climate records. Over the last 50 years, perhaps 8-12% of May 18ths have witnessed highs somewhere in the 72-73 band, but that historical frequency does not directly translate to market probability when facing forward one day. Modern numerical weather prediction models generate probability distributions showing typical uncertainty ranges of ±3 to ±5 degrees around a central forecast high. For the market's YES condition to resolve true, several atmospheric variables must cooperate: cloud cover patterns must suppress afternoon solar heating, afternoon wind speeds must remain moderate to weak, and no strong ridge of high pressure can establish itself over the region. Pushing highs above 73 degrees would require clearing skies, insolation enhancement, or warm southerly flow. The 1% YES odds suggest real-time forecast models are converging on a substantially different outcome—likely warmer than 73, given typical May conditions. This market exemplifies precision weather trading: it isolates an extreme degree of forecasting exactitude. The $8,207 in liquidity and $2,001 in 24-hour volume reflect the niche nature of daily temperature range prediction, where only specialized traders or weather enthusiasts participate.
What are traders watching for?
Forecast model consensus for May 18 high temperature; NWS official morning prediction and uncertainty bounds by 6am ET
Real-time satellite and radar May 18 morning; cloud cover or clearing determines afternoon warming and peak temperature
Upper atmosphere jet stream and pressure systems; passing cold front could suppress highs into 70-71°F range
Afternoon wind speed and solar radiation; calm winds and clear skies would push high above 73°F
How does this market resolve?
The market resolves on May 18, 2026 using the National Weather Service official reported high temperature for Central Park, New York. YES wins if the highest temperature recorded on May 18 falls between 72 and 73 degrees Fahrenheit inclusive.
Polymarket Trade is an independent third-party interface to the Polymarket CLOB prediction market exchange on Polygon — not affiliated with Polymarket, Inc. Prediction markets aggregate trader expectations into real-time probability estimates. Every market question resolves YES or NO based on a specific event outcome; traders buy shares of the side they believe will resolve positively. Prices range 0¢ (certain no) to 100¢ (certain yes) and naturally reflect the crowd-implied probability of YES. Polymarket Trade is non-custodial — your funds never leave your wallet. Open the full interactive page linked above to place orders, see order book depth, and execute a trade.
