 Climate data is vital to understanding the impacts of climate change on health. 74% of weather and climate data services provide climate data to health sectors globally. But this data is underutilized. Only 23% of ministries of health have a surveillance system that uses meteorological data to monitor climate-sensitive health risks. Climate data can be used in many ways, such as early warning systems for climate-sensitive infectious disease or extreme heat. The climate and health sectors must come together and improve how we use climate data to make tools reliable and accessible to all.