The infrared (IR) wavelength band of emitted energy is widely used for military purposes by detecting and discriminating objects against the background. Particularly, the ship in the marine environment can be easily exposed to the IR detector because the object has different surface temperature and optical properties as compared to the surrounding background. Previous study focused on the characteristics of the object IR signal for uniform atmospheric conditions. However, the atmospheric condition may not be uniform due to the local fog or rain. For non-uniform aerosol compositions, the IR signal from the object changes according to the local variation of the transmissivity of the atmosphere between the object and the detector. In order to efficiently calculate the detected infrared signal, it is necessary to estimate the atmospheric transmissivity by using the weather data set measured at discrete locations with optimized measurement points. In this study, the IR signal transfer characteristics through a nonuniform atmosphere originated from objects is analyzed using a software named as the Silhouette developed in our lab. We are suggesting an optimum locations of local weather data suitable for the analysis of the IR signal transfer characteristics of the object.