A method includes identifying images corresponding to sky conditions. The method further includes isolating cloud pixels from sky pixels in each of the images. Responsive to determining percentage of cloud pixels in one or more of the images meets a threshold value, the method further includes determining predicted cloud movement relative to sun position by tracking similar feature points between two or more images of the images. The method further includes causing a tint level of an electrochromic device to be controlled based on the predicted cloud movement relative to the sun position.