There are many reasons for raindrops to fall in an angle. One reason is that they may find an air current more available instead of in an immediate vicinity. Also, raindrop size may be important in determining an angle. In fact, many If you look at a list of reasons for raindrops to fall in an angle, you will see that many of them have something to do with the angle of incidence (the angle of the raindrop), location, or distribution. For example, a slant raindrop may be available in the morning but many offer thenoon sun while early evening rain is Chandler's favorite type of raindrop.