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What exactly do you mean by "identify changes in images"? Do you want to detect new objects that enter the scene or understand the changing weather conditions? The answer could change depend on what your goal is.
For more robustness against weather changes, you can try deep neural networks (esp. convolutional neural nets) provided that you have enough training images. But depending on the actual images, the solution could also be much easier. What are you trying to achieve with background subtraction?