How to Document Weather Delays on a Construction Site

Every construction contract acknowledges that weather happens. What they don't always agree on is what constitutes a compensable or excusable weather delay, who bears the burden of proof, and what documentation is required to support a claim. That documentation burden falls on you — and the only way to meet it is daily weather logging from the moment your project starts.

Why Weather Documentation Matters

Most construction contracts include provisions for "unusually severe weather" as an excusable delay event — meaning the contractor can claim a time extension without liquidated damages. Some contracts also allow compensation for weather-related costs if the weather was truly extraordinary.

The critical phrase is "unusually severe." To support a weather delay claim, you need to demonstrate that the weather was worse than historical norms for that location and time of year — not just that it rained. That demonstration requires two things: (1) your contemporaneous on-site weather records, and (2) historical weather data for comparison. Your daily log provides the first; National Weather Service or commercial weather data provides the second.

Without your own records, you're relying entirely on third-party weather services, which report conditions at the nearest weather station — which may be miles from your job site and not reflective of actual on-site conditions. Your daily log, corroborated by NWS data, creates the strongest possible record.

What to Record Every Day

Temperature

Record the high and low temperature for the day, or the temperature at key times (morning start, midday, end of shift). Temperature matters for concrete work (cold weather concreting requirements), painting and coating applications, asphalt paving, and masonry.

Precipitation

Type (rain, sleet, snow, freezing rain), estimated amount, and duration. Note the time precipitation started and stopped. "Light rain, 7 AM to 11 AM, approximately 0.3 inches" is a useful record. "It rained" is not.

Wind

Estimate wind speed (calm, light, moderate, strong, gusting). Note sustained winds vs. gusts if they're significant. Wind matters for crane operations (most cranes have maximum wind speed limits for picks), scaffolding safety, and exterior finishing work.

Sky conditions

Clear, partly cloudy, overcast, fog. This is particularly relevant for solar or daylight-dependent work, but also establishes the general atmospheric conditions for the day.

Impact on work

Don't just record the weather — record what the weather caused. "Rain from 7–11 AM. Suspended earthwork operations; soil at required moisture content, grading not possible. Crew reassigned to interior rough carpentry. Approximately 4 hours of earthwork lost." This impact statement connects the weather condition to a measurable work impact, which is exactly what you need for a delay claim.

Weather and Change Orders

Weather documentation supports more than just time extensions. It's the foundation of any change order related to weather-related costs: temporary heat for cold-weather concrete protection, additional dewatering caused by unexpected rainfall, re-mobilization costs after a weather shutdown, or additional materials consumed due to weather damage.

Each of these change orders requires you to establish (a) that the weather event occurred, (b) that it was beyond the contract baseline, and (c) that you incurred specific costs as a direct result. Your daily log provides the evidence for (a). NWS historical data provides the baseline for (b). Your cost records provide (c).

Using Weather Services to Supplement Your Records

Several services provide certified weather records for specific locations and dates — useful for dispute resolution. The National Weather Service (weather.gov), Weather Underground, and commercial services like DTN or Weather Decision Technologies can provide certified historical records that are admissible in arbitration and litigation. Your daily log corroborated by certified weather data creates an extremely strong evidentiary record.

When Weather Doesn't Justify a Delay

Weather that is within normal historical ranges for your project location and season is typically not an excusable delay event, even if it inconveniences your schedule. If you're building in Chicago in January and it snows, that's foreseeable — it should be in your schedule baseline. If you're building in Dallas in August and you experience a rare ice storm, that's a different argument.

This is why your baseline schedule documentation matters as much as your daily weather logs. When you submitted your schedule, what weather days did you include? Comparing your assumed weather days against actual weather days lost is the core of a weather delay analysis.

Logging Weather with ConstruTrack

ConstruTrack includes weather and delay documentation as part of every daily report. Log conditions, note the work impact, and attach photos. When you submit, everything is compiled into a dated PDF. Over the course of a project, your daily reports become a continuous weather record that's time-stamped, professional, and ready to share with your attorney or claims consultant if needed.

The free plan is available at no cost — one project, unlimited daily reports. Start documenting today.