Weather, with its built-in atmospheric laboratory, is a natural source of inquiry. The ever-changing nature of weather provides a constant source of questions to investigate and connects to a multitude of physical science concepts. The question, “How accurate are homemade weather instruments in measuring air pressure, rainfall, wind speed and direction?” led fourth- and fifth-grade students to collect and record data, to compare and contrast their data with local weather data, to learn the fundamentals of how weather instruments work, and to form conclusions about weather and climate.