A Medieval Book of Seasons by Marie Collins and Virginia Davis
About the cycle of the year in medieval times.
Opens with a discussion of measuring time in the era, and some other aspects of medieval life, and then four sections on spring, summer, fall, and winter. Includes a lot of illustrations for Books of Hours, which were heavily conventionalized -- from England to Italy, despite the differences in climate, the activities were usually the same and seldom even shifted by month -- but a good source of information. Discusses agriculture, animal husbandry, games, and more.
Popular rather than scholarly.