earth-minimum

Updated: May 17, 2025

But this identical area, from a little below 60° to the pole, is that occupied by the snow-caps of Mars, and over the whole of it the winter temperature must be far lower than the earth-minimum of-88°F. Then, as the Martian summer comes on, there is less than half the sun-heat available to raise this low temperature after a winter nearly double the length of ours.

Alfred Russel Wallace - Is Mars habitable? A critical examination of Professor Percival Lowell's book "Mars and its canals," with an alternative explanation