Photographers often deal with a variety of light sources, each of which has it’s own color cast. When compared to daylight in the middle of the day, tungsten lighting, like that which comes from traditional incandescent bulbs, looks yellow. Standard fluorescent lighting looks green. Light in shade, or on a cloudy day will have a bluish cast compared to midday sun. These color casts are referred to as the color temperature of the light. Color temperature is measured in degrees Kelvin. To beginners, color temperature will appear to be a bit backwards.
Depending on if the sun is setting or if your model looks a bit more severe, than the light lets on. Regulating your White Balance to the mood of the situtation, can not only tell a story but bring forth what emotion, you want to come across.