Most bronze memorial plaques are designed to have a high tolerance for extreme temperature fluctuations. Normal temperature changes in most climates, indoors or outdoors, will have no adverse effect upon these signs. Of course, extreme weather conditions such as hurricanes and tornadoes can damage bronze plaques, but extreme temperature changes alone will usually not cause a problem.
Ask the sign manufacturer if there are any temperature or weather issues that you should be aware of when purchasing your logo sign. If there are any weather or temperature problems associated with your bronze plaques, ask for details and be sure to get any maintenance instructions to effectively deal with potential problems.
Bronze memorial plaques may eventually develop a greenish patina on its surface from exposure to moisture and air. Keeping the plaque clean and free of dust slows this process, and patina can be removed if it does develop.