The atmosphere and (probably) the interior of Mars differ substantially from that of the Earth. The atmosphere is much less dense and of different composition, and it is unlikely that the core is molten.
|Variation in temperature at the Viking 1 landing site|
The preceding image shows the variation of the surface temperature over a period of 50 Martian days at the Viking 1 landing site (data source). Notice the large variation between night and daytime temperatures (associated with the low density of the atmosphere) and the almost constant high and low temperatures for this period. Compare this, for example, with the daily temperature variations for Nome, Alaska (note however that the Nome plot is in degrees Fahrenheit, not Celsius).
Here is a graph of Martian atmospheric temperature variations as recorded over a period of days at the Pathfinder (1997) landing site compared with data from the Viking 1 site over a similar period in 1976 (in the these graphs a Sol is a Martian day, which corresponds to 24 hours and 37 minutes of Earth time). At the time of these observations, the night temperatures drop to around -90 degrees celsius, but at the Pathfinder site the day temperature approaches a relatively balmy -10 degrees celsius at it peak.