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Rain Delay Letter Generator

Lost days to weather and need to send a formal notice to the GC. This tool pulls daily precipitation and wind data from the nearest reporting station for your job site address and delay dates, then generates a PDF letter with the data table inside. No more copy-pasting from Weather Underground.

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How to use the generator

  1. Enter your company and signatory info. Company name, the person signing the letter, and their title (project manager, superintendent, owner, etc.).
  2. Enter the project and recipient. GC or customer being notified, project name or contract reference, and job site address.
  3. Pick the delay date range. Inclusive start and end dates for the period you lost to weather. The notice date at the top of the letter defaults to today.
  4. Fetch the weather data. Click "Fetch weather data". The tool pulls actual daily precipitation, wind, and conditions for your address and date range from the nearest reporting station.
  5. Download the PDF. Review the preview, then download a professional letter with the weather table and source citation baked in.

What makes a good weather delay notice

A weather delay notice that actually gets accepted has three things. It is sent inside the contractual notice window (usually 7 to 14 days of the delay event). It names the specific dates and the specific job. And it cites real data you can back up. Hand-waving (“it rained a lot last week”) does not meet the standard. This tool handles the third part by pulling the actual records so you can focus on the timing and the project context.

  • Specific dates. Inclusive start and end, not “last week”.
  • Specific site. The job address, so reviewers can cross-check.
  • Specific data. Precipitation in inches or mm, max wind, conditions.
  • A named source. Nearest weather station, with provider attribution.
  • A formal sign-off. Name, title, company on letterhead.

Frequently asked questions

How does this tool know what the weather was?

When you enter a job site address and a date range, the tool queries historical weather records from the nearest reporting weather station and pulls daily precipitation totals, max wind speeds, and condition summaries. Those values populate the letter so you don't have to hunt them down from NOAA or Weather Underground yourself.

Is this legally binding documentation?

The letter is a notice you author yourself using a template. It is not a legal filing, and this tool does not provide legal advice. It helps you assemble a professional weather delay notice with real data attached. Whether any particular GC or contract accepts it depends on your contract terms, the notice window, and the specifics of the delay. For contract interpretation or a disputed claim, talk to a construction attorney.

Where does the weather data come from?

Weather data is sourced from WeatherAPI.com's historical weather service, which aggregates reporting weather stations near your address. Values are daily totals at the nearest station, not point measurements at the job site. We make this clear in the generated letter so reviewers know exactly what they are looking at.

What counts as a "weather day"?

There is no universal answer. It depends on your contract. A common threshold in AIA A201 and many subcontract forms is 0.25 inches (6.35 mm) of precipitation in a day, with reasonable cause to believe work could not proceed. Some contracts use different thresholds or reference a 10-year average. The tool reports both total rain days and days above the 0.25-inch threshold so you can cite whichever your contract uses.

How far back can I look up weather?

Historical weather data is available going back several years for most locations. Very recent dates (last 24 hours) may not be in the archive yet, so use dates at least 1 to 2 days old.

Is this free?

Yes. No signup, no email, no watermark. SpoilStack is a paid job and machine tracker for small excavation contractors. This tool is free. If you want every job's weather auto-logged across your whole operation, not just retroactively for a delay notice, that is what SpoilStack does.

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