Reviews through animation and live-action photography man's efforts to learn more about the forces affecting weather and climate, and presents the variety of instruments and techniques employed in their search. Describes the world-wide character of meteorological studies; and the effects of solar radiation, the water cycle and the wind patterns have on the weather. Portrays the analysis of observational data by computers to develop weather forecasts. Cloud seeding, weather balloons and rockets are shown to provide data on atmospheric variables influencing weather. Pictures made by Tiros 1 in April, 1960 are included. Planet Earth Series. (National Academy of Sciences; CRM) 1961