Well, do you know what....
I've just been watching Henry Cole riding his Saxon/Harley Vee-Twin on the TV "Travel Channel"; "Worlds best motorcycle rides", riding down Route 1 on the East coast in mid-day September, and I made a special note to examine the clear sky scenery during his travels, and low and behold, the sky is exactly the same as it appears in the first Pic in this Thread!
Deep blue sky overhead, gradually tapering down to almost white on the horizon!
Looks like the default Flights Sim "Weather" settings are almost perfect!
Paul....

...!
P.S...whilst on the subject of U.S. roads, can any of my U.S. Chums tell me how they cope with the fact that the long, famous, Route 1 Interstate Highway appears on BOTH the US East Coast AND the US West Coast!
Two major roads with the same number!
..confusing?
....

....!
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.