With HomeLink® Universal Transceiver
WARNING: This page is about a different car, the 2006 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
Push the (N) switch when the ignition switch is in the ON position. The outside temperature will be displayed in "°F". To change the indication from "°F" to "°C", push and hold the (N) switch for about 3 seconds until the display begins to flash. Press the (N) switch again to toggle between "°F" and "°C".