Agroclimatology is a Ruby client library for accessing solar radiation and meteorological data from NASA’s POWER Agroclimatology Web Resource. It allows users to fetch historical data based on geographic coordinates and optional year ranges. The library returns daily radiation metrics, including top-of-atmosphere insolation, surface insolation, and radiative flux, as structured Ruby objects. Designed for developers and researchers, it provides a simple API for integrating agroclimate data into agricultural decision support tools and data pipelines.