Livestock production facilities exist in environments that may differ significantly from the conditions at the closest weather station. Additionally, the livestock safety index is no longer available over commercial radio/television stations for many livestock production areas. A need exists to integrate local weather data as collected by a dedicated weather station located at a feedlot into single livestock safety factor accessible to livestock producers for management decisions. A low cost commercial weather station was combined with a dedicated microprocessor to produce a weather monitor that displays feedlot cattle heat stress indices based on the combination of temperature and humidity (THI). Discussion will include operational experiences during the summer of 2002.