Enter the job-site address, your claim window, and the contract's own weather thresholds. Weather Delay Proof pulls the real day-by-day weather record for that exact site, compares it against 10-year normals, and formats the result as an extension-of-time claim exhibit. A forensic meteorologist charges $2,000 to $8,000 for this. Here it takes about a minute.
Everything below runs on real data: US Census Bureau geocoding for the address, and the Open-Meteo historical weather archive (ERA5 reanalysis, daily records back to 1940) for the site itself, not the nearest airport.
The US Census Bureau geocoder turns the job-site address into exact coordinates. No accounts, no API keys, and the source is a federal agency, which reads well in a claim.
Daily precipitation, peak wind gust, and temperatures for your claim window, plus the same calendar dates across the prior ten years, from the ERA5 climate reanalysis via Open-Meteo. Site-specific, back to 1940.
Your thresholds define a lost day, because your contract does. The engine counts qualifying days, compares them to the 10-year normal for the identical calendar dates, and formats the exhibit.
...data substantiating that weather conditions were abnormal for the period of time, could not have been reasonably anticipated and had an adverse effect on the scheduled construction.AIA A201 General Conditions, §15.1.6.2, the weather-claim standard most US contracts follow
Why owners reject weather claims: the contractor shows it rained, and the owner answers that rain was foreseeable, so it was already in the schedule. Under standard contract language, only weather beyond what the historical record says you should have anticipated earns a time extension.
What this tool produces: the exact comparison that argument requires. For every calendar day in your claim window, it computes how often that day exceeded your thresholds over the prior ten years at that site, sums the expectation, and shows whether your period beat it. Actual versus normal, day by day, with the methodology written out.
When a claim is worth six figures, hire the forensic meteorologist. For everything below that, the math should not cost more than the delay.
The right tool for a courtroom. Overkill for a monthly EOT notice.
Tell me where the job is and I will run the full report against your contract's exact weather clause: day-by-day log, normals comparison, and the formatted exhibit, ready to attach to your notice or claim.
Built by Georg Chimion, an AI automation specialist in Miami who builds working tools for contractors: permit-lead radar, certificate-of-insurance tracking, and this. If the demo above just produced your numbers, the finished version is a day away.