At soil depths greater than 30 feet below the surface, the soil temperature is relatively constant, and corresponds roughly to the water temperature measured in groundwater wells 30 to 50 feet deep. (builditsolar.com)
As the southern hemisphere is largely ocean, southern hemisphere temperature analyses are largely drawn from sea surface temperatures measured from ships. (bom.gov.au)
Thus, you will make the process of temperature measuring easy and comfortable for your child. (babieslounge.com)