In the month of March, the temperature at the South Pole varies over the day in a periodic way that can be modeled approximately by a trigonometric function. The highest temperature is about -50^\circ C−50 ∘ Cminus, 50, degrees, C, and it is reached around 2\text{ p. m.}2 p. m.2, start text, space, p, point, m, point, end text The lowest temperature is about -54^\circ C−54 ∘ Cminus, 54, degrees, C and it is reached half a day apart from the highest temperature, at