Effect of Monsoon Rainfall Variability on Wheat and Rice Yield in India

Indian agriculture remains heavily dependent on the southwest monsoon, and even small changes in rainfall timing, amount, or distribution can significantly affect the productivity of major food crops such as wheat and rice. This study examines how variability in monsoon rainfall, seasonal temperature, and the occurrence of dry spells over the past 15–20 years has influenced wheat and rice yields across major agricultural states in India. Daily and seasonal rainfall and temperature data obtained from the India Meteorological Department (IMD) were analyzed alongside district-level crop yield records to identify patterns and statistical relationships between weather conditions and crop performance. The analysis shows that years with delayed monsoon onset or extended dry periods during the critical flowering and grain-filling stages of crops experienced notably lower yields, with reductions often ranging between 10 and 20 percent compared to climatologically normal years. Conversely, excessive or untimely rainfall during the harvesting period was associated with crop lodging, grain damage, and reduced quality. The study also observed a gradual shift in crop growing seasons, with both wheat and rice maturing slightly earlier in recent years, likely linked to rising average temperatures. These findings highlight the vulnerability of rainfed and partially irrigated cropping systems to monsoon variability and underline the importance of accurate seasonal forecasting and early-warning systems for farm-level decision-making. Improved access to weather-based advisories can help farmers optimize sowing windows, irrigation scheduling, and harvest timing. The results offer practical insights for farmers, agricultural extension officers, and policymakers working toward climate-resilient farming practices in India, particularly as monsoon patterns continue to shift under ongoing climate change.