No, 75 degrees Celsius, which is 167 degrees Fahrenheit. Unlikely your garage gets that high, but that's not really how the temperature ratings work anyway. Temperature derating calculations would start from a different number anyway, but isn't going to matter since you have a moderate temperature area.
We're getting way off into the weeds here, but I was just curious what this aluminum wire was that was originally for an 80A circuit, and it seems it probably was properly rated, but easily will be fine for a 60A circuit if the final portion can transition to copper.