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This is the twenty-seventh issuance of the annual assessment first known as Climate Assessment and now known as State of the Climate and is a special supplement to the Bulletin of the American Meteorological Society. It documents the status and trajectory of the many components of the climate system. By doing so, this report also documents the status and trajectory of the world's capacity and commitment to observe it.

An overview of findings is presented in the Abstract, Fig. 1.1, and Plate 1.1. Chapter 2 features global-scale climate variables; Chapter 3 highlights the global oceans; and Chapter 4 includes tropical climate phenomena including tropical cyclones. The Arctic and Antarctic respond differently through time and are reported in separate chapters (5 and 6, respectively). Chapter 7 provides a regional perspective authored largely by local government climate specialists. A list of relevant datasets and their sources for all chapters is provided as an Appendix.