First recorded by The Prisonaires (1953).
Hit version by Johnny Ray (US #2/UK #1 1956).
From the wiki: “The Prisonaires were real prisoners doing time at the Tennessee State Prison in Nashville when this recording took place at Sun Records, in Memphis, handcuffed and at gunpoint. Writers Johnny Bragg and Robert Riley got their royalties (including those on Johnny Ray’s hit version) the day they were released. The best-known version of the song was recorded by Johnnie Ray in 1956, staying atop the UK Singles Chart for seven weeks. Ray initially disliked the song, but sang it based on the recommendation of Mitch Miller.”
The Prisonaires documentary (2012):
Johnny Ray, “Just Walking in the Rain” (1956):