The dataset identifies the dates when occurred climate extremes of heatwaves and coldwaves in the city of Campinas, São Paulo between the years 1956 to 2018. The heatwaves and coldwaves were determined based on the minimum and maximum temperatures recorded by three different weather stations in Campinas. The dataset was built by the Data Science for Climate and Health Research Group. For more information: https://github.com/climate-and-health-datasci-Unicamp/py-climate-health-toolbox