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Cordulus

Cordulus makes solar-powered weather stations that are installed directly on a customer's own site — a field, a construction site, a solar park, a road stretch or a racetrack — together with an app, an AI forecasting service and an API that turn those on-site readings into forecasts, alarms and operational decisions for that exact location. It is sold as a subscription (hardware-as-a-service), not as a one-off hardware purchase.

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-20T19:23:22.297Z. Cached copy · Source on cordulus.com

# Cordulus

> Cordulus makes solar-powered weather stations that are installed directly on a customer's own site — a field, a construction site, a solar park, a road stretch or a racetrack — together with an app, an AI forecasting service and an API that turn those on-site readings into forecasts, alarms and operational decisions for that exact location. It is sold as a subscription (hardware-as-a-service), not as a one-off hardware purchase.

Cordulus is a Danish company founded in 2015, part-owned by Danish Agro (a large Scandinavian agriculture group). More than 4,500 Cordulus stations are deployed across 22 countries. The public website is https://www.cordulus.com.

**The problem Cordulus addresses.** Temperature and rainfall can differ meaningfully over distances of less than 10 km. Public weather station networks are spaced far too widely to capture that variation, so a regional forecast is often wrong for a specific field or work site. A Cordulus station sits at the place where the decision is made, so the data and the forecast are specific to that location rather than to a region.

**The hardware.** The station is rugged, pre-assembled and 100% solar-powered, with a built-in mobile (GSM) connection — it needs no mains power and no Wi-Fi. Installation takes about 15 minutes using an included ground screw, 2 m steel pipe and magnets. Standard sensors measure wind speed, direction and gusts; air temperature, humidity and pressure (dew point is derived from these); soil temperature via an in-ground probe; and precipitation. A root-zone soil moisture sensor is available as an optional add-on. Solar radiation, UV index and cloud cover are shown in the app from external data sources rather than from an on-station sensor.

**Measurement accuracy (published customer-grade figures).** Air temperature ±0.3 °C from −40 to 0 °C and ±0.2 °C from 0 to 60 °C; relative humidity ±2 percentage points; soil temperature ±0.5 °C from −10 to 60 °C; rain ±2 % over a range of 0–60 mm/hour; wind speed ±0.5 % below 5 m/s and ±3 % from 5–50 m/s. Readings are taken every 10 minutes and stored permanently, so historical data for a site is always available. The rain gauge is a tipping-spoon type, so it measures liquid precipitation only — not snow or hail.

**The forecast.** Cordulus runs a 14-day hyperlocal forecast that combines global model data (GFS) with live measurements from each individual station, so the output is specific to that station rather than a regional average. It is reported as roughly 48 % more precise than traditional forecasts over the first 100 hours. The separate AI rain forecast is reported as roughly 52 % more accurate than traditional forecasting methods at predicting rain showers: it updates every 10 minutes (conventional numerical models are too computation-heavy to update more than about hourly), predicts rain movement up to 8 hours ahead, analyses roughly 1,536 km² of context around the site, and is built on a deep-learning model trained
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