Write in the body, not the subject!
1) The average temperature of the EQUATOR of Mars is -55 C
2) The average temperature of the dry valleys is -20 C
3) paradoxically, the most hospitable places for life on Mars ar near the polecaps, where although it is -125 C for half the year it is almost clement for the other half, with 24-hour sunshine in the summer.
4) If you can beat the cold, the thin air, and the total lack of biosignatures, you're a better man than me, Gunga Din!