Can the data support the claim?
Compare hot-day counts without hiding missing observations.
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Observed hotObserved belowUnknownOne tile = one calendar day, in date order.
Possible change
—Inspect the evidence and limitations
Thresholds are demonstration choices, not official heatwave definitions. Unknown means absent, missing, or quality-flagged values in this downloaded series. It does not establish that no observation exists elsewhere. One station cannot represent a city. The source hash identifies bytes, not measurement truth.
No runtime AI, blockchain, accounts or external API calls. Codex assisted development. This is a local research prototype.
Raw source SHA-256:
| Period | Expected days | Usable | Unknown | Hot-day range |
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