Recently, the interest in a new type of propulsion for atmospheric flight has rapidly grown. Based on the acceleration of ionised air through a strong electric field, the ionic air-breathing thruster would bring multiple benefits in both environmental and economic terms. The absence of moving parts, low noise production, and no carbon emissions are just some advantages of this technology. However, the feasibility and application of these non-thermal plasma propulsion systems are still in their infancy, which is why the European IPROP project aims to explore their capabilities and improve their performances. Few, if any, studies in the literature describe how these thrusters are affected by external environmental conditions, such as temperature and humidity.