Most illustrators and even science books will show raindrops as tear shaped. The idea has persisted in popular culture for unknown reasons.
We see the tear shape and we think...rain. Your local TV news channel will even illustrate a coming rain storm with tear shapes!
Raindrops start out as round high in the atmosphere as water collects on dust and smoke particles in clouds. But as raindrops fall, they lose their rounded shape.
Instead, a raindrop is more like the top half of a hamburger bun. Flattened on the bottom and with a curved dome top, raindrops are anything but the classic tear shape.
The reason is due to their speed falling through the atmosphere.