Measurements of the atmosphere improve the performance weather forecasts, underpin our understanding of Earth’s changing environment, and help inform climate models that are used to look at future climate scenarios. Measuring the atmosphere is non-trivial and expensive so why do we bother? ‘Atmospheric measurements’ considers the necessity of both atmospheric modelling and data collection. By combining information from both, more realistic results will be produced. It then describes some of the numerous processes involved in taking measurements—from fixed, ground-based observations to weather balloons, research aircraft, and satellite technology that allows the collection of data hundreds of kilometres above the Earth’s surface.