As countries design and implement policies and actions for climate change mitigation and adaptation, the production, disclosure, monitoring, and use of data will be essential to understand risks, track progress, enable informed action, and evaluate impact across a range of sectors. Effective climate action calls for a coordinated and coherent response across societies, underpinned by shared information. While national governments must play a lead role in responding to climate change, the Paris Agreement and subsequent Talanoa Dialogue have clearly established that contributions from subnational governments, the private sector, and civil society are crucial for success. Just as national governments both produce and use data, non-state actors may play both roles as well. Compiling and encouraging access to climate-relevant data empowers cities to develop low-carbon development plans, informs private sector investment decisions, and allows civil society to participate more effectively and translate information to less data-literate users. Improved data access can also foster more robust collaboration among diverse sectors and actors, a fundamental ingredient in the climate change agenda given its intersectionalilty and the crucial need of coordination for impactful actions.