Philadelphia Weather Prediction Markets & Temperature Odds

Which station settles a Philadelphia contract

Philadelphia's daily high and low ladders are Kalshi's, listed as the KXHIGHPHIL and KXLOWTPHIL series, and their rules name one record: the maximum or minimum temperature "recorded at Philadelphia (CLIPHL)" for the day, as The Weather Company reports it. CLIPHL is the National Weather Service's daily climate report for Philadelphia, issued by the forecast office in Mount Holly, New Jersey. That office keeps Philadelphia's climate records under station KPHL, which the National Weather Service lists as Philadelphia International Airport, and the records its report printed for October 19, 2026, a record high of 86°F from 2016 and a record low of 29°F from 1976, match the KPHL record book.

So a Philadelphia temperature contract is a question about one thermometer at the airport, read through one data provider. A downtown rooftop, a backyard thermometer or a phone app can show a different number on the same afternoon, and none of them count. Kalshi's rules say as much: other weather services may help a reader follow the day, but the figure that settles the contract is the one The Weather Company reports.

How the Philadelphia ladders are built

Each observation day carries two rows, a high and a low, priced as separate questions about the same day. A row is a short run of two-degree bands with an open band at each end. For October 21, 2026, the high ladder Kalshi opened on October 20 runs from 60°F or below to 69°F or above, with the four bands between them two degrees wide, and the low ladder runs from 41°F or below to 50°F or above. A band such as 80° to 81° pays if the reading is 80 or 81, both ends included.

Every band pays in full or not at all, so the prices along a row read as one spread of chances rather than a shelf of unrelated contracts, and the band with the highest price is the one the market favors. The high and low rows answer different questions: a mild afternoon on the high row says little about how far the night falls on the low row.

When a Philadelphia contract settles

Kalshi's temperature terms rank their sources: The Weather Company first, then the National Weather Service. Only the first official report that is not marked preliminary counts, read at its full precision, and any revision published after the contract expires is ignored. Expiration is set at 10 a.m. Eastern, and settlement follows no later than the next day. Kalshi's rules add a warning for anyone watching the number come in: preliminary figures can differ from the final reported value through rounding and unit conversion.

Trading runs past midnight. Kalshi's October 20, 2026 contracts stop trading at 1 a.m. Eastern on October 21. If no reading is available by the expiration date, the terms let the exchange settle every band at the last fair price it determines, which is written into the contract rather than decided afterward.

What the Philadelphia board leaves out

Only temperature trades here. The Philadelphia board carried no rainfall ladder on October 20, 2026, when Kalshi had no Philadelphia rain contract open, and only the days an exchange has open sit on it; a day that has been measured and closed leaves the board. Every band on both rows is quoted by one book, Kalshi, so each row names it once, and no cell on the page links out to it. Pennsylvania's other cities would join the Pennsylvania weather hub under the same rule once an exchange lists daily ladders for them, and the legal status page holds what the record shows about the exchanges that quote them.