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This paper addresses a novel approach to constructing seasonal nomograms for both planning and operations environments. The paper describes how the nomograms were automatically constructed for the Idaho Power Co. (IPC) power system network. The approach presented in this paper offers a unique capability to automatically determine the effect of various stressing factors on the studied interfaces (paths) in planning and operations environments. This approach also allows the operator to determine and visualize the secure operating region. The study was performed using the IPC loadflow data to validate the proof of concept and determine the effect of various stressing patterns on the monitored paths in the IPC power system. The approach proposed in this paper will allow operators to construct seasonal nomograms in operations environment.