Wanderlust World Wanderlust World No. Copper's temperature simply equilibrates with its surroundings. It does not have an intrinsic daily cycle.
Because copper is an excellent thermal conductor, it feels hotter than wood on a sunny day (rapidly draws heat from your hand) and colder at night (draws heat away quickly). But its actual temperature matches the ambient environment—air, sun, shade—just like any other material.
The perception of "hot by day, cold by night" is a tactile illusion caused by high thermal conductivity, not a unique property of copper.