Spatiotemporal Analysis of Rainfall Anomalies in Semi-Arid Regions: A Comparative Study of Tonk District Vs. Rajasthan Regional (Post Monsoon 2025)

This paper analyzes the weekly rainfall departures in the Tonk district of Rajasthan for the South-West Monsoon season of 2025 (June–September). Using weekly departure data, the study highlights extreme precipitation volatility in Tonk compared to the climatological norms of the wider Rajasthan state. The data reveals significant "Large Excess" events, specifically during late June (+627%) and late August (+466%), suggesting localized hyper-precipitation events. The study discusses the implications of such variability on the catchment areas of the Banas River basin versus the general state-wide rainfall trends.