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Climate change is expected to have severe consequences on the lives and livelihoods of millions of people around the world, but its effects will not be evenly distributed. Africa is thought to be especially vulnerable, given both high exposure to climate change and relatively low community resilience and governance capabilities. With climate change adaptation looming ever larger as an important policy area, understanding where climate vulnerabilities are located therefore has immense practical significance. This article details the methodological refinements made to an existing model of climate security vulnerability, the rationale for the approach, and the findings. The model introduces more fine-grained data and new methods of normalizing the data to retain more granularity, as well as other changes. The vulnerability maps show the Horn of Africa (Somalia in particular), South Sudan, the eastern coasts of Madagascar and Mozambique, northern Nigeria and southern Mali, Burundi, Sierra Leone and Guinea, as well as pockets along rivers and coasts in Egypt and Nigeria to be the most vulnerable. For validation, the model is also compared to maps of climate-related disaster counts, fatalities, and affected populations derived from the EM-DAT International Disaster database. [ABSTRACT FROM AUTHOR]