average ground temperature
The 50 degree constant ground temp is a common misconception. The ground temps vary by location and reflect the average annual temperature of the surface. For example the average air temp over the course of 1 year might be 65 F in the south and so the average ground temperature will be about 65.In a northern clime with an average air temp of 45 F the average ground temp will be 45F.he 50 degree constant ground temp is a common misconception. The ground temps vary by location and reflect the average annual temperature of the surface. For example the average air temp over the course of 1 year might be 65 F in the south and so the average ground temperature will be about 65.