The Conclusion chapter reiterates the book’s approach, focus and main points. It reminds the reader that the book has concentrated on local, provincial, peripatetic and otherwise relatively marginal sites of scientific activity and shown how a wide variety of spaces were constituted and reconfigured as meteorological observatories. The conclusion reiterates the point that nineteenth-century meteorological observatories, and indeed the very idea of observatory meteorology, were under constant scrutiny. The conclusion interrogates four crucial conditions of these observatory experiments: the significance of geographical particularity in justifications of observatory operations; the sustainability of coordinated observatory networks at a distance; the ability to manage, manipulate and interpret large datasets; and the potential public value of meteorology as it was prosecuted in observatory settings. Finally, the chapter considers the use of historic weather data in recent attempts by climate scientists to reconstruct past climates and extreme weather events.