The conventional flood cooling method fails to minimize the heat generation in the cutting areas and make adverse effect on the environment during machining process. Hence CMQL (Cryogenic Minimum Quantity Lubrication) is used as coolant in this work, which gives lubrication and reduces the temperature to greater extend and also it is environment friendly. The selection of cutting conditions and appropriate tools for efficient machining process is a challenging process, hence it is necessary to optimize the machining parameters. A modified TOPSIS method using Gower distance has been proposed in this paper for the optimization of Nimonic 80A alloy. The machining parameters such as Surface Roughness (Ra) and Temperature (T) under 3 different environments namely (i) dry, (ii) wet and (iii) cryogenic MQL with different feed rate & cutting speed are examined in the optimization of Nimonic 80A alloy. Optimized results confirm that environment and feed rate are dominant factors and the environment influence is about 84.6%, followed by feed rate at 10.1%. Cryogenic MQL has better effectiveness compared to conventional cooling. The modified TOPSIS method is found to be more effective in machining problems.