The 90 and my daughter, the journey continues....
For those who live in regions of the world that have temperature designed to support life. Ground temperature is one of those more specialised readings that most people do not worry about. Ground rather than air temperature has to be at or below zero for snow to stay on the ground and not melt when it lands. Ice also forms so is used for when to do gritting of surfaces. Farms use this temperature to determine if some activities can be done so might be for your neighbours