Rapid urbanization and rising carbon emissions transform urban climates, posing significant challenges to ecosystems and human health. As educational communities and public spaces, campuses play a model role in sustainable planning. While research on campuses in hot and humid regions is extensive, studies on northeastern China, especially Jilin Province, are limited. This study examines the outdoor environment of Yanbian University in Jilin Province through on-site measurements and ENVI-met simulations to analyze and optimize thermal comfort. Results confirm the feasibility of ENVI-met for cold temperate monsoon climates, highlighting the significant impact of sky view factor and vegetation coverage on thermal comfort (PET). Adjustments to building openings and elevated structures effectively improve outdoor comfort, providing design strategies for optimizing campus spaces in this region.