Climaterna is a comprehensive dataset integrating public data from validated sources, including the Mortality Information System (SIM) and the Live Births Information System (SINASC) of DATASUS, the Brazilian Daily Weather Gridded Data (BR-DWGD), and pollution data from the CMIP6 platform. The dataset comprises anonymized microdata on all births and deaths across Brazilian municipalities, with daily granularity from 2011 to 2022. It also includes annual climate and pollution data for the same period and geographic scope. This integrated dataset enables diverse analyses exploring the relationships between health and environmental variables, particularly focusing on maternal and neonatal health outcomes in Brazil. By combining data from officially validated sources, this dataset supports robust research in epidemiology, public health, and environmental sciences. Furthermore, it can also support journalistic reporting and serve as a reliable resource for anyone interested in cross-referencing climate, health, and pollution data.