This technical report outlines the methodology used in the selection and development of climate hazard indices for use in the WHO Health and Climate Change Country Profile project. The report describes in detail the scope and underlying principles of the development of national climate hazard indices for use in the health and climate change country profiles (Chapter 2), the indices that were selected and why they are relevant for health (Chapter 3), the methodology used to develop climate hazard indices under high and low emissions scenarios (Chapter 4), a description of the data analysis, the time series plots, summary statistics, and how to interpret the findings (Chapter 5) and finally, some of the limitations of the data and areas for improvements (Chapter 6).