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Liquid water droplets that fall from the sky when cloud droplets combine and grow heavy enough to fall to Earth due to gravity. Rain typically forms in warm clouds.

Ice crystals that fall from the sky when water vapor condenses directly into ice without becoming liquid first; these crystals stick together. Snow usually forms in cold clouds at temperatures below 0°C.

Rain that falls as liquid but freezes upon contact with cold surfaces creating a coating of glaze ice. Freezing rain forms when snowflakes melt into rain in a warm layer of air, then fall through a shallow cold layer near the ground without refreezing.

Balls or irregular lumps of ice that fall from clouds. Hailstones form when updrafts in thunderstorms carry water droplets high enough into the atmosphere where they freeze. Successive layers of ice form as the hailstones are carried up and down by the updrafts and downdrafts.

Small pellets of ice that occur when raindrops freeze before hitting the ground. Sleet forms when snowflakes pass through a warm layer of air and then refreeze as they fall through a colder layer.