Partner solution
Cordulus: weather data directly from your site.
Rain, wind and temperature can change construction schedules. Cordulus measures conditions at the location; Construction Weather makes them part of your OX project documentation.
Updated: October 2026
How do Cordulus and Open Experience complement each other?
Cordulus builds weather stations for construction sites and supplies historical measurements as well as site-specific forecasts. As our weather partner, Cordulus is behind Construction Weather, the weather offering from Open Experience. In OX, you choose which stations and values feed into your daily construction reports. This documents conditions at the project location rather than the region's general weather.
Measurements from the mast, forecasts in the app
Construction Weather works with the Cordulus station on a mast. It measures temperature, precipitation, wind speed, humidity and air pressure, and the values flow into your daily reports in Construction Diary. You decide in the Construction Diary settings which stations and values appear there. The Cordulus weather app adds a forecast for the location and identifies bad-weather days.
What the Cordulus forecast adds
The station measures and Cordulus looks ahead: for exactly the point where it stands, not for the nearest major city.
- Hyperlocal instead of regionalThe forecast refers to the location of your station. Across several sites, this keeps conditions distinguishable instead of averaging them over a region.
- AI-supported forecastingCordulus combines established weather models with its own post-processing and states a 48 % reduction in forecast error compared with the underlying models (provider's figure, source below).
- Lead time for critical workConcrete pours, crane work and scaffolding depend on wind, frost and rainfall. Seeing the development early means rescheduling instead of losing a day.
- App, interface and data exportThe values are available in the Cordulus app, through an interface and as an export — the basis on which Construction Weather transfers them into your project environment.
A forecast is an estimate, not evidence. For documenting weather after the fact, only the station's historical measurements count.
Make weather-related interruptions traceable
Connect documented weather conditions with daily reports, photos and details of affected work. This makes it easier to reconstruct the conditions your team worked in.
Weather data alone does not establish entitlement to an extension of time or payment. Relevant factors include the contract, specific effects on construction progress and required notices.
Expert article: weather in the site diary
Which four details make a weather entry hold up, at what point the weather really stops work, and what a reading taken on the mast proves compared with a forecast or a reference station.
Provider and source
Cordulus
Weather stations, historical measurements and site-specific forecasts. The provider's construction solution describes measured variables, data export and the interface offering. It is also where the stated 48 % reduction in forecast error appears.
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Frequently asked questions
Are measurements and weather forecasts the same thing?
No. The station measures conditions that actually occurred at the location. A forecast estimates future conditions. Historical measurements are the relevant basis for documenting past weather.
Do measurements enter the construction diary automatically?
Yes. Construction Weather feeds the data into Construction Diary's daily reports. The stations are connected to your OX project environment and the required values are selected.
What does the figure of 48 percent refer to?
Cordulus states a 48 percent reduction in forecast error for its AI-supported forecast compared with the underlying weather models. This is the provider's own figure; we report it as such and point to the source.
What do the weather station and OX connection cost?
The station and weather service are offered through the partner; the scope of OX integration depends on the package. We clarify hardware, weather service and OX services separately to suit your project.
Make weather part of your documentation.
In the demo, we discuss your site location and show how to use weather data in your OX project.