Calculating color temperature in the IR/Microwave scale can be approached using Wien's Law, which relates the peak frequency of radiation to temperature. For room temperatures like 273K, 263K, and 253K, the same principles used for visible light can apply if the radiating object behaves like a black body. It is suggested to analyze the microwave spectrum, similar to how the cosmic background temperature is determined. Plotting the spectrum around the peak frequency can help identify the temperature, while also accounting for potential microwave interference. Understanding these methods allows for accurate temperature calculations beyond just visible light.