Dear all,
The first forecasting period of the ECMWF AI Weather Quest (September–November 2025) concluded earlier this autumn, and we are pleased to share that its evaluation is now complete, with full period-aggregated results available on the Leaderboards page. Overall engagement was very strong, with a total of 166 competitors, 35 teams, and 60 models participating across the SON period.
SON forecast data release
All SON-period forecast data is now publicly available for independent verification, reproducibility, and exploratory analysis: AI Weather Quest Data Portal. Team-specific datasets are also accessible directly from each team’s page.
Methodology summaries published
Teams have shared concise methodology descriptions outlining model architectures, input data, and training or ensemble strategies. These are available on each team’s page: Teams • AI Weather Quest.
Upcoming Webinar – SON Awards
We will present the SON results and highlight the top-performing teams during the SON Awards Webinar on 18 December. All participants are warmly invited to join: AI Weather Quest: SON Awards Webinar (December 18, 2025): Overview · ECMWF Events (Indico).
What’s Next
The second forecasting period (December–February) is underway, and new teams are welcome to join at any time.
Many thanks to all SON participants for your contributions and continued engagement!
Olga