This paper contributes to the existing literature on climatic variability and food security. It analyses the impact of climatic variability on food security for 71 developing countries, from 1960 to 2008. Using two complementary indicators of food security (food supply and proportion of undernourished people), we find that climatic variability reduces the food supply and the proportion of undernourished people in developing countries. The adverse effect is higher for African Sub-Saharan countries than for other developing countries. We also find that the negative effects of climatic variability are exacerbated in the presence of civil conflicts and are high for the countries that are vulnerable to food price shocks.