This file describes codes for variables v179-v199 of the SCCS data set. They are from previously unpublished codes done by John W. M. Whiting, originally referenced in "Winter temperature as a constraint to the migration of preindustrial peoples" Whiting et al. American Anthropologist 84:279-298 (1982). The weather data are cited as coming from Walter, H., and H. Leith (1964) Klimadiagramm-Weltatlas, Jena: Gustav Fischer.