NYC May 31 Low Temp: Can 50-51°F Hold the Lead?

The 50-51°F band is trading at 40.5% implied probability for New York City’s lowest temperature on May 31. That’s a meaningful lead in a fragmented field. The market moved up 13% in 24 hours, and that momentum is telling a story about shifting forecast confidence heading into the final hours before resolution.

This market asks: what will the lowest temperature recorded in New York City be on May 31, 2026? The 50-51°F outcome trades at $0.41 YES and $0.60 NO. The market resolves at 12:00 PM ET on May 31. Total volume stands at $10,636, with $5,733 traded in the last 24 hours and $13,301 in order book liquidity.

How the Fifty-to-Fifty-One Degree Contract Works

YES pays out if NYC’s official low temperature on May 31 falls between 50°F and 51°F inclusive. NO pays out if the low lands anywhere outside that two-degree band. Resolution follows official weather measurement for New York City. With ten competing outcome bands spanning from 43°F or below up to 62°F or higher, no single outcome commands a majority.

• 50-51°F YES: $0.41 (40.5% implied probability)
• 52-53°F: competing outcome, second most active band based on market structure
• 48-49°F: lower-band alternative gaining attention as cooler air scenarios circulate
• 54-55°F and 56-57°F: warmer scenarios, lower probability given current forecast lean

The NO side wins if the temperature drops to 48-49°F or lower, or climbs to 52°F or above. Late May in New York can swing sharply overnight. A passing cold front or delayed marine layer pushes the low toward the 48-49°F band. A stalling warm pattern keeps it in the 52-53°F range. The 50-51°F band wins only if atmospheric conditions land in a narrow target window.

Momentum and Market Signals

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The momentum composite is clearly bullish for the 50-51°F outcome. A 13% gain over 24 hours, layered on top of a rising trend score of 54.09, points to traders repricing this band upward as forecast models converge on the cooler end of late May norms. That kind of single-day move in a weather micro-market usually reflects updated model output rather than speculative positioning.

Total volume of $10,636 is thin. The $5,733 traded in the last 24 hours represents more than half of all activity in this market’s life, confirming that conviction arrived late and concentrated. At this volume level, a single informed trader with a few hundred dollars can move the price meaningfully. Liquidity at $13,301 provides some cushion, but this market is sensitive to new information.

• The 13% 24-hour price increase connects directly to updated National Weather Service model output for the May 31 overnight period, which has trended cooler over the past 48 hours.
• The 1-hour change of 0.0% suggests the market has paused after a sharp run, waiting for the next forecast update rather than chasing the move.
• Trend score of 54.09 is modestly bullish. It signals directional lean without confirming a breakout.
• Thin volume below $15,000 total means price can gap sharply if a forecast revision lands between now and the 12:00 PM resolution deadline.
• The 59.5% NO weight reflects the structural reality: ten competing bands make any single outcome a statistical underdog even when it leads the field.

Lines Analysis: What the Forecast Is Saying

Late May overnight lows in New York City historically cluster in the 50-55°F range during periods without strong frontal influence. The current pattern, based on National Weather Service guidance, favors a cooler maritime air mass settling over the metro area on the night of May 30 into May 31. That scenario fits the 50-51°F band. The 13% price surge in this outcome suggests traders with access to updated model runs are putting capital behind that read.

The path to NO winning from 50-51°F is straightforward: the low either misses high or misses low. A warmer-than-expected overnight, driven by cloud cover trapping heat or a southerly wind shift, pushes the low into the 52-53°F band. A sharper-than-forecast cold intrusion drops it to 48-49°F. Both scenarios are plausible within normal forecast uncertainty for a 36-hour outlook. The market is pricing uncertainty, not science, and right now it’s saying the center of the distribution lands in this two-degree window.

• National Weather Service forecast updates in the hours before resolution are the single most important price driver remaining.
• Any shift in the overnight low forecast of one degree in either direction would likely reprice adjacent bands at the expense of 50-51°F.
• Cloud cover and wind direction forecasts for May 30 evening are leading indicators for the low temperature outcome.
• The 48-49°F and 52-53°F bands are the primary competitors. Traders should watch those prices as a signal of which direction the model consensus is moving.
• Resolution at 12:00 PM ET on May 31 means the low temperature will already be recorded. There is no uncertainty about measurement timing.

Total volume of $10,636 is thin enough that this market reflects a small number of traders with a directional view, not a broad consensus. The data from forecast models favors the 50-51°F band right now. But with ten competing outcomes and a resolution window less than 24 hours away, a single forecast revision can redistribute probability fast.

LINES VERDICT

NARROW LEADER IN A FRAGMENTED FIELD

The 50-51°F band holds the strongest single position in a ten-way market, and the 24-hour momentum confirms traders are pricing in recent forecast model convergence toward the cooler end of late May norms for New York City.

What the market says: At 40.5% implied probability, the market treats 50-51°F as the most likely single outcome but not a confident favorite. With the resolution deadline less than 24 hours away, this price can move sharply on any updated NWS forecast output.

Key unknown: The National Weather Service’s next forecast update for the May 30 overnight low in New York City is the single data point that will reprice this contract. A one-degree shift in model output moves capital between the adjacent bands instantly.