The process of oil extraction within an oil mill involves the workers being exposed to a number of risks: movement of loads, specific postures, high level of noise etc. among these, one of the least studied is that of the microclimatic conditions within the workplace. By the term “microclimate” we mean the climatic variables within the workplace which cause temperature changes for those working there. A comfortable microclimate produces, when we talk of temperature and humidity, a feeling of satisfaction in most people; inappropriate microclimatic conditions, however, even when they do not have pathological effects, can cause physical discomfort and induce lower productivity and situations of danger.