The Colors of the New York City Sky

I came across this fascinating site: New York City Sky, which shows the average color of the sky in NYC, updated every 5 minutes.
However, I suspect the images are taken with a rather simple camera which automatically adjusts the lighting settings. Because it can be measured that the color of the light may vary wildly over the day. A lot more, in fact, than in shown on the website. Nevertheless, the site is amazing.
I showed some of the same in my series of Taj Mahal pictures, previously.