As a child I found it curious that banks always had signs with the time and temperature displayed. You still see it occasionally, usually on older banks. I often re-notice it when I spot a bank that's a classic representative of an earlier decade's architecture.
I recently re-asked myself that question: Why did banks have signage that included the time and temperature? One reason, I suspect, is that it helped position banks as local institutions and part of the community. Sharing that information acts as a public and civic service. It also transforms a bank into a point of focus within its surroundings. It gives people reason to "look to" the bank. This is where the practice becomes treacherously clever. By anchoring themselves to fixed, universal aspects of reality it presents banking institutions as part of the natural order of things. Immalleable, unquestionable, and irrefutable presences in the world.