Choosing color for the look of the environment can show a huge difference between a sunlight outdoor and the overcast light. the sunlight would be the main light, which any color would be bright contrast to it. The blue sky would have blue show a little on building and objects. The reflected light shows colors from other areas bounce from one area to another area.
Gurney, James, Color and Light: A Guide for the Realist Painter, Kansas City, Missouri, Andrews McMeel Publishing, LLC, 2010