In this chapter, temperatures of different horizontal surfaces, i.e. angle between the plane of the surface and the horizontal is zero degree, are determined at 21^st of June, i.e. 172^nd day of the year, at 12:00 noon solar time of the day, i.e. solar hour angle is zero degree, namely angular displacement of the Sun east or west of the local meridian due to rotation of Earth on its axis is zero degree, and at four different locations. The locations are Anchorage, Alaska at 61.17 degrees latitude north, Seattle, Washington at 47.61 degrees latitude north, Sacramento, California at 38.58 degrees latitude north and San Diego, California at 32.73 degrees latitude north. All four locations are very close to the sea level, namely altitudes vary between 9 meters and 35 meters. So altitude effects are neglected in the following calculations.