NYC Low Temp on May 18: Can 66-67°F Hold at 44%?

A single overnight temperature reading in New York City is splitting traders almost down the middle. The 66-67°F bucket holds a 44% implied probability heading into May 18, while the market leans toward a cooler outcome. That lean is shifting fast. A momentum composite combining the one-hour and 24-hour price changes with a trend score of 71.36 tells a clear story: money moved into this contract sharply and recently, likely tracking updated National Weather Service model runs for the metro area.

The resolution date is 2026-05-18 12:00:00. Whatever the overnight low registers at official Central Park observing station records, that number closes this market. Eleven temperature buckets compete here, from 53°F or below all the way up to 72°F or higher. Right now, 66-67°F is the leading single bucket at 44%, but 56% of market probability is parked on everything else combined.

How the 66-67°F Contract Works

This market resolves YES if the official lowest temperature recorded in New York City on May 18, 2026 falls within the 66-67°F range. The National Weather Service Central Park station is the standard reference for New York City daily low temperature records. Resolution occurs at 2026-05-18 12:00:00 based on official meteorological data.

• YES (66-67°F): $0.44 per share, 44% implied probability. Pays out if the overnight low lands in that two-degree band.
• NO (any other outcome): $0.56 per share, 56% implied probability. Pays out if the low falls anywhere outside 66-67°F.

The contract misses YES whenever the overnight low drifts below 65°F or climbs above 67°F. Mid-May in New York City typically produces overnight lows ranging from the upper 50s to the low 70s depending on air mass origin. A cooler Canadian air intrusion pushes the low toward the 60-63°F buckets. A warm southerly flow or persistent cloud cover can hold overnight temperatures above 68°F. The 66-67°F range is climatologically plausible for mid-May, but it is a narrow two-degree window in a market with eleven competing outcomes.

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Momentum and Market Signals

The combined momentum signal here is unusually sharp for a short-duration weather market. The one-hour and 24-hour price changes both read +17.5%, and the trend score sits at 71.36. That composite moved together, suggesting a single trigger rather than gradual drift. The most likely driver is a National Weather Service forecast update or a new European Centre model run that narrowed the expected low into the 66-67°F range.

Total market volume is $5,927, with $3,603 trading in the last 24 hours. Liquidity sits at $5,148. These are thin numbers. Volume well below $1 million means this price can reprice sharply on a single updated forecast or a large individual trade. The current 44% reading carries real uncertainty, not just meteorological uncertainty.

• The 1h and 24h price changes both registered +17.5%, a synchronized move pointing to a specific information event rather than organic drift.
• The trend score of 71.36 places this market in active repricing territory, not a stable equilibrium.
• $3,603 in 24-hour volume is thin. One updated NWS forecast or ensemble model shift could move this contract several percentage points before resolution.
• Trader sentiment reads 44% YES and 56% NO, a modest bearish lean that reflects the structural difficulty of hitting any specific two-degree bucket.
• Open interest reads $0, which alongside thin volume reinforces that liquidity constraints are real here.

Lines Analysis: What Supports Each Side

The National Weather Service May forecast for New York City puts the region in a transitional pattern. Mid-May low temperatures at Central Park average around 55-60°F historically, but anomalously warm spring air masses have pushed overnight lows above 65°F with increasing frequency in recent years. If a southerly flow persists through the night of May 17-18, the 66-67°F bucket sits squarely in range. The sharp upward momentum in this contract over the past 24 hours suggests updated model guidance moved toward that scenario.

The 56% NO lean reflects real probability spread across ten other buckets. The 68-69°F bucket, the 64-65°F bucket, and the 62-63°F bucket each carry their own probability mass. A temperature forecast carries inherent uncertainty even 24 hours out. The margin for error in hitting exactly 66-67°F versus landing at 65°F or 68°F is smaller than most weather models can reliably distinguish. That structural challenge is what the NO side is pricing.

• National Weather Service: any updated forecast showing a cooler or warmer air mass arriving overnight on May 17-18 would reprice this contract immediately.
• European Centre for Medium-Range Weather Forecasts ensemble runs: if the ECMWF shifts its overnight low projection by two degrees in either direction, the 66-67°F bucket loses or gains probability fast.
• Cloud cover and dewpoint data for the New York metro area: persistent overcast conditions hold overnight lows higher; clear skies allow radiative cooling toward lower buckets.
• Central Park official station reading at resolution time: the single number that closes this market, expected by 2026-05-18 12:00:00.

The $5,927 total volume market is pricing meteorological uncertainty across eleven buckets. The data currently favors the 66-67°F outcome enough to hold it as the leading single bucket at 44%. But with resolution less than 33 hours away and thin liquidity throughout, the next NWS model run matters more than any single trade.

LINES VERDICT

Narrow Lead, Thin Market

The 66-67°F bucket holds the highest single-outcome probability at 44%, driven by a sharp momentum signal that tracks updated forecast guidance. The market is pricing uncertainty across eleven competing temperature bands in a contract that resolves on one overnight reading.

What the market says: At 44% implied probability, traders give this specific two-degree band a slightly below-even shot. That is actually a meaningful lead when eleven outcomes compete. The thin liquidity means this number can shift several points in either direction before the 2026-05-18 12:00:00 close.

Key unknown: The next National Weather Service forecast update for New York City overnight temperatures on May 17-18 is the single most important data point remaining. A two-degree shift in the projected low would move probability from the 66-67°F bucket to an adjacent band instantly.

Scientific Context

New York City’s mid-May temperature climatology puts average overnight lows in the upper 50s to low 60s at Central Park. Anomalously warm spring conditions in recent years have elevated that baseline. The 66-67°F bucket sits above the historical average for this date, which means current trader sentiment is implicitly pricing a warmer-than-average overnight scenario. The related market asking where 2026 will rank among the hottest years on record sits at 58%, providing context: traders broadly expect 2026 to run warm, which is consistent with elevated overnight low expectations in New York City this spring. That background warming signal gives the 66-67°F range more plausibility than it would carry in a climatologically average year. Any significant cold front pushing through the Northeast before resolution would invalidate that assumption and reprice the lower-temperature buckets immediately before 2026-05-18 12:00:00.

Frequently Asked Questions

• What does 44% probability mean here? The 44% implied probability means the market gives roughly a four-in-ten chance that New York City’s official overnight low on May 18 lands specifically between 66°F and 67°F.
• What pays out on the NO side? Any official overnight low outside the 66-67°F range resolves this contract NO. That includes ten other temperature buckets from 53°F or below up to 72°F or higher.
• What event would move this price most before resolution? A National Weather Service forecast update shifting the projected overnight low by two or more degrees would immediately reprice which bucket holds the most probability.
• When does this market resolve? Resolution occurs at 2026-05-18 12:00:00, based on the official lowest temperature recorded in New York City on May 18, 2026.
• Is the volume reliable for this market? Total volume of $5,927 is well below $1 million. Thin liquidity means the current 44% price can move sharply on a single updated forecast or a moderately sized individual trade.

This analysis reflects market conditions as of 2026-05-17 03:12:08. Prediction market probabilities are volatile and shift as new data and regulatory decisions emerge, especially as the 2026-05-18 12:00:00 resolution date approaches. Lines.com does not accept bets or provide financial or gambling advice. All market outcomes are uncertain.