>>1702701That's just the white balance. If you set it to "incandescent" (same thing as "tungsten", I forgot which term Nikon uses) you'll get a bluer sky.
For the raw file, you can either set the balance manually (top picture, looks like 3500K was a good guess) or select part of the picture you want neutral grey (bottom picture, I clicked somewhere around the red X). Don't know what software you use, this is the free software from Nikon (Capture NX-D).
