Figure 2 Twenty feet under the surface, the soil temperature reflects the average ambient air temperature during the year. (pearltrees.com)
It does take longer to liquefy 55 gallon drums this way (a few days) in the winter, but it more closely resembles ambient air temperatures in the tropics. (healthytraditions.com)
RPO Code (UVD) Heated steering wheel changes to (KI3) Automatic heated steering wheel; automatic heated steering wheel builds on the functionality of the automatic heated front seats based on ambient air temperature (gmauthority.com)