Black skies are not very common. Except at night. (They are pretty common at night. I think that’s why they call it night).
Most of the time (daytime) the skies are blue or gray with an occasional treat of red and orange during sunrise and sunset.
Black? Better head for the storm shelter because that means there’s a blow a brewing. Or more likely a squall.
Black skies and white steeples. Great combo.