This resource book introduces third-grade children to the environment by studying the weather and its effects. Lessons are provided including: (1) constructing a weather diary; (2) thermometers; (3) clouds; (4) barometric pressure; (5) wind vanes; (6) heating and cooling air; and (7) analyzing weather data. Each lesson includes a listing of materials, objectives, process skills developed, necessary teacher information, procedures, closure material, worksheets, and handouts. Many student-made weather related instruments are developed. Three quizzes and a unit test are provided. Reference materials include a listing of supplementary audiovisual materials, correlated texts, vocabulary, an overview of unit objectives, definitions of process skills, teacher background material, and general advice about weather instruments. (MVL)