you can download the nikon software to process the raw images, i believe it's free.
lower kelvin number is oranger and higher is bluer. shadow and cloud is warmer than sunlight. colour temperature is weird, it's backwards actually in it's adjustments (adjusting the kelvin higher will add more warmth to the image in hopes of making it neutral, and the opposite is true also going lower, it will add more blue)
once you have the raw software, it'll just be a matter of using the slider to get to where you want.