The Meteorology (Greek: Μετεωρολογικά; Latin: Meteorologica or Meteora) is a treatise by Aristotle. It touches on a range of subjects which would come under the province of astronomy or geology today, as well as meteorology proper, to which it was the only major contribution before early modern times.
Internet Archive: L 397 - Aristotle Meteorologica. Loeb edition. Greek with an English translation by H.D.P. Lee. Multiple formats.
Internet Archive: The Works of Aristotle Vol III. Translated into English under the editorship of W.D. Ross. Meteorologica translated by E.W. Webster. Multiple formats.
Internet Classics Archive: Meteorology, translated by E.W. Webster. HTML and TXT formats.
University of Adelaide (Internet Archive): Meteorology, translated by E.W. Webster. Multiple formats.
Wikisource: Μετεωρολογικά, Greek text. Multiple formats.
Wikipedia: Meteorology (Aristotle).
The Great Conversation: Further reading at Tom's Learning Notes
Ancient Greek resources: Learn to read Greek classics in the original.