History and specifics
Snow is usually white in color and requires a temperature of below freezing in order to remain solid.
Snow is common on many class M planets including Andor, Bajor, Rigel X, and Earth. (TOS novel: Final Frontier, ENT episode & novelization: Broken Bow, ENT episode: "The Aenar", ST - Typhon Pact novel: Plagues of Night)
In 2240, ten-year-old Spock saw snow for the first time during a visit to Minneapolis on Earth, when his mother Amanda Grayson took him to visit relatives. The snow drifts were as tall as he was. (TOS novel: Planet of Judgment)
- TOS novel: Final Frontier
- ENT episode & novelization: Broken Bow
- ENT episode: "The Aenar"
- TOS novel: Planet of Judgment