Winter cities with heavy snow and cold regions, it is important how to apply urban design process to place entrenched within winter climate. In Hokkaido cities, new urban design approaches have to be developed considering to regional climate, snow and cold wind. Authors provided the new approaches with relationship between urban designs and environmental assessments, with the snow and wind simulations using the wind tunnel. Two kinds of "positive" and "negative" urban design guidelines are provided for the new Wakkanai station district redevelopment program. Those guidelines depend on the environmental assessments are useful for reflection to the new urban design process
