In the month of January, the sun shines vertically on the Tropic of Capricorn in the Southern Hemisphere, due to which summer season is there in this hemisphere. In this hemisphere, the isotherms follow the latitudes, and in the far south, they surround the Antarctica continent from all the four sides continent. 0° centigrade isotherm proceeds from the South Polar Circle.
The isotherms of 10° and 20° centigrade temperature pass from the southern part of South America and southern parts of Australia The 20° isotherm crosses South America from southern Australia, crossing South – Western part of Africa and proceeds upwards after entering the ocean. The 40° isotherm follows approximately the 60° south latitudinal circle.
