This image shows the nighttime (2AM) temperatures measured
by the Thermal Emission Spectrometer (TES) instrument on the
Mars Global Surveyor wrapped on to a globe. The coldest
temperatures (shown in purple) are -120C and the warmest
temperatures (white) are -65C.
The view is centered on Isidis Planitia (15N, 270W), which is
covered with warm material, indicating a sandy and rocky surface.
The small, cold (blue) circular region to the right is the Elysium
volcanoes, which are covered in dust that cools off rapidly at night.
At this season the north polar region is in full sunlight as is relatively
warm at night. It is winter in the southern hemisphere and the
temperatures are extremely low(~-120C).