Intra-growing season dry–wet spell pattern is a pivotal driver of maize yield variability in sub-Saharan Africa

Abstract

Climate variability plays a crucial role in the annual fluctuations of crop yields, posing a substantial threat to food security. Maize, the main cereal in sub-Saharan Africa, has shown varied yield trends during increasingly warmer growing seasons. Here we explore how sub-seasonal dry–wet spell patterns contribute to this variability, considering the spatial heterogeneity of crop responses, to map weather-related risks at a regional level. Our results show that shifts in specific dry–wet spell patterns across growth stages influence maize yield fluctuations in sub-Saharan Africa, explaining up to 50–60% of the interannual variation, which doubles that explained by mean changes in precipitation and temperature (30–35%). Precipitation primarily drives the onset of dry spells, while the influence of temperature increases with event intensity and peaks at the start of the growing season. Our large-scale, data-limited analysis approach has the potential to inform climate-smart agriculture in developing regions. Maize yield variability in sub-Saharan Africa has important implications for food security and livelihoods. By combining the time specificity of weather-related impacts on crops and different agroclimatic zones, this study shows that shifts in sub-seasonal dry–wet spell patterns are a major contributor to this variability.