Outside air temperature (OAT)

“Outside air temperature (OAT)” refers to the temperature of the ambient air outside of a vehicle, building, or other system. It is an important measurement for a variety of purposes, including determining the performance of engines and other mechanical systems, as well as the comfort level of occupants. The OAT is often measured using sensors that are located in a strategic location outside of the system being monitored. This temperature reading is typically corrected for compression and friction heating, so that it accurately represents the true air temperature. The OAT is sometimes also referred to as the true air temperature, as opposed to the temperature of the air within an enclosed space, which may be higher or lower than the outside temperature.