Highest temperature in Chicago on August 9?

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Market context

Chicago’s airport has already been bracketed by a warm August pattern: the long-run normal high for 9 August is about 83.3°F, while the historical record for that date is 97°F, so a reading in the mid-80s sits close to climatology rather than in rare-heat territory.[3][11] That is why the market’s present pricing around the 84–85°F band was already broadly in line with both normals and recent guidance, even before the day was fully complete.[1][3] The 0% pricing on the colder buckets implies traders see little chance of a meaningful cool anomaly, despite the fact that Chicago’s August temperatures can still swing materially if clouds or rain suppress afternoon heating.[1][4]

Comparable August 9 cases support reading this as a temperature-distribution market rather than a binary hot/cold call. Weather Underground’s resolution rule makes the final published daily-observations maximum decisive, so the exact airport trace matters more than any headline high-low summary elsewhere.[1] The key historical anchor is that Chicago’s August 9 average high is only 83.3°F, with most recent daily normals clustered in the low 80s, which means an outcome in the 84–85°F range is ordinary rather than exceptional.[3][7] Extreme upside exists, but it is rare: the date record is 97°F, more than 10°F above normal, and that gap shows how much margin is needed before a market moves into genuinely hot-territory outcomes.[11]

For traders, the main catalysts are the final airport observation sequence, any late-day shower or thunderstorm coverage, and whether the last hourly update before the settlement cutoff locks in a peak that cannot be overtaken.[1][4] The market description notes revisions remain possible until the first datapoint for the following date is published, so a late-night adjustment in the official table can still matter if the daily maximum is close to a bucket boundary.[1] In practice, the useful watch items are the NWS local observations and any forecast update indicating cloud cover or convection around the afternoon maximum, because those are the factors most likely to cap the high in the mid-80s rather than push it materially higher.[2][3]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

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