Forecasting the Onset of the Indian Monsoon
The Project
The interdisciplinary team of atmospheric scientists, AI experts, and economists worked to identify which of the many open-access weather models best predicted the start of the monsoon across different regions. The key attribute: The model had to accurately forecast not only the physics of the atmosphere but also the information the farmers needed.

They tested seven models over nearly 60 monsoon seasons and found Google’s NeuralGCM—a probabilistic model that offered 32 different predictions—and the European Centre for Medium-Range Weather Forecasts’ (ECMWF) Artificial Intelligence Forecasting Systems (AIFS) consistently outperformed other AI and conventional models at this task. Because each model had different strengths and weaknesses, the team mathematically blended the Google and the ECMWF models and over 100 years of historical rainfall statistics from the India Meteorological Department. This blend produced a probabilistic model with a 30-day lead time.
The Ministry of Agriculture and Farmers’ Welfare knew that a 30-day forecast would be useful to farmers. They implemented the delivery of the forecast to 38 million farmers directly using their SMS platform. The Odisha state government also partnered with the research team to reach nearly 1 million more through a voice messaging platform. Precision Development (PxD), a global nonprofit supporting smallholder farmers in digital advisory services, led message design and testing. The team generated real-time forecasts for several weeks in May to July. Probabilistic forecasts then turned into messages. The farmers received the messages weeks before the monsoon hit.
Typically, the Indian summer monsoon begins over southern India in June—the government declares the monsoon season has started—and the monsoon advances smoothly northward, bringing sustained rainfall to most of the country by July. This year, however, the monsoon was unusual. It hit the southern part of India earlier, leading most to expect an early monsoon season to come to their various communities. The monsoon progressed for about a week, and then it stopped for close to three weeks before moving again. The new AI-based forecast predicted that pause.
Forecast Information
Technical details of the forecasts, benchmarking, and operations can be found here.






