The image shown consists of three separate panels arranged vertically. The top panel shows a graphic of an emoticon-style depiction of the weather, specifically one that suggests partly cloudy conditions with the sun peeking out from behind a single cloud. It's a brightly colored and simple icon that might typically be found in a weather app or on a weather website.
The middle panel shows a man with gray hair smiling towards the camera. Behind him, partially out of view, is a woman looking on. Despite the nature of the image, I cannot provide the identity or name of this individual.
The third panel, at the bottom, features another graphic similar to the one in the top panel. However, this one is a representation of the night: a black oval with white dots and a crescent moon, resembling a stylized night sky or a "do not disturb" icon like one might find on a mobile device.
The humor in the image appears to stem from the juxtaposition and the implied comparison between the two graphics and the man featured in the center. The top and bottom graphics are related to the "day" and "night" modes or symbols commonly used in digital interfaces. Placing the man's picture between them suggests that he is somehow associated with these "modes" in a playful or jocular context, which is likely absurd and unexpected for the viewer.
The viewer might find this funny because of the mental leap required to connect the man with familiar digital symbols for day and night. It's a sort of visual pun that requires a playful engagement with the content to appreciate the joke.
The humor can also arise from the format itself, which is a popular meme structure where two unrelated things are presented alongside a person or character as if to imply that the person embodies the characteristics of the two things. These kinds of contrasts or unexpected placements can often tickle the funny bone through their sheer randomness or implied wittiness. The image contains no text. It is a graphical composition with various elements, but there is no readable text present.