The record high, and low temperatures that I have ridden in, were both on the '81 R65 .
High temperature : 122 F.(50C.) in July, 1995 here in Phoenix, the low was : -22 F.(-30C.) in Chicago, January, 1982 .
The low temp record, I only rode the bike around the neighborhood side streets, for 5 miles, the bike had heat lamps on it, and I had a 'torpedo' type combustion heater in the garage, garage temp was a 'toasty' 50 F.