During the daytime, rain usually creates a generally blurred appearance to the scene. When clear and well defined, photos of rain show fine white streaks that cover the image vertically, just as you’d expect. In a photo, drops of falling rain look like streaks of motion.
At night, raindrops appear as a multitude of white spots. As you can see in the last photo, digital cameras sometimes interpret these spots as colored dots. In any case, there is always a large number of anomalies. Rain does not commonly produce an image that shows a single anomaly. Lots of drops mean lots of dots.