This digital resource is a historical documentary edition. At its core are transcribed texts of handwritten documents, supplemented by contextual and explanatory apparatus. The edition draws on two categories of documents from Thomas Jefferson’s papers. The main body of the content consists of the record of daily meteorological observations he maintained, with gaps, from July 1776 to June 1826. In this period Jefferson noted weather conditions at 99 locations, including his home in Virginia, Monticello; Paris, France; Philadelphia; and Washington, D.C. Depending on period and location, the records at times include, in addition to the temperature and general weather conditions, details on barometric pressure, air moisture, wind direction and force, and amounts of rainfall or snow. Jefferson occasionally also noted information relating to ecology and seasons, such as the appearance of certain bird species in the spring or the first availability of produce such as peas and strawberries.