>>96263462
You did a good job googling just now but still wrong, seethe-kun. You've never looked at art and don't understand color, but the correct reason highlights are cooler in a lot of art, as explained correctly already, is that we do it earlier in the day. The reason for this is that (in the northern hemisphere anyway) sunlight is cooler in the mornings and increasingly warm culminating in sunset. Monet's famous Haystacks series illustrates this.
Not cooler because of any reflections. It's the way that the atmosphere filters sunlight (called atmospheric perspective, well known from no less than the Mona Lisa). The best light for painting is in fact on an overcast winter day, before noon. This is when light is the most accurate for color rendition.