Which 1960s and 1970s U.S. variety show featured appearances from the "hippy dippy" weatherman?

At one point in the late 1960’s when George Carlin was on “The Smothers Brothers Comedy Hour”, he performed the witty character of “Al Sleet, the hippy dippy weatherman”. At the time, nobody thought that he (Carlin) would morph into the man with the “7 words you can’t say on TV” (1972! The year [he] graduated high school!).

George Carlin gave the public quotes and invented the beloved character known as "Al Sleet, the hippy dippy weatherman". "Here's your hippy dippy weatherman with all your hippy dippy weather, man," Carlin liked to say, before beginning a spaced out forecast. "Weather tonight: dark. Turning partly light by morning." (Al Sleet, the Hippy Dippy Weatherman, 1966)