The main goal of this paper is to model and implement an atmospher model in a flight simulator that simulates the flight of a general aviation training propeller aircraft. This paper also focuses on the analysis and application of various parameter values related to the atmosphere model on performance features as well as to real-time simulations with a pilot in the loop. The atmosphere model was built as a subordinate system into the existing flight simulation model in MATLAB and SIMULINK. This model allows us to determine some important and useful quantities related to the atmosphere around the aircraft. The built-in atmosphere model consists of: the standard atmosphere model according to the ISO standard, a non-standard atmosphere model, a wind model and a selected turbulent wind model. The non-standard atmosphere model is divided into four types of atmospheres that are created through data from military standards. The wind was divided into constant wind and wind in the boundary layer, while the Dryden model was chosen to model the turbulent wind for simulation purposes. The considered aircraft of this paper is a Cessna 172 for which individual performances in different types of atmosphere are shown. Some existing aircraft control systems and instruments required for data visualization during flight simulation have also been improved. For the purpose of evaluating the embedded model, tasks were performed and test flights were conducted with pilots on a simulator, during which subjective assessments and flight data were collected. At the end of the work, an analysis of the collected data was made and an assessment of the level of handling quality and pilot workload was performed. MATLAB and SIMULINK were used for data processing and programming, while FlightGear platform was used for visualization purposes.