He stares out the window that faces the street; it’s a still December night—no traffic, no sirens, no obnoxious noise or light. Across the street, a string of colored Christmas lights wrapped around a porch railing glow beneath a blanket of thick snow. He’d rather be on the can reading Richard Wilbur. He turns back to the class.
This portion of the writing is vivid because it uses illustrative words to describe the setting which causes the reader to use their imagination to put themselves into the story and see what the character sees.