Viking 1 Temperature at 0.34 Sol Time-bin for Sols 1 to 116 and 134 to 199.

Temperatures are for about 8:22 AM on Mars.

It is believed that when temperatures fall or stay cold outside of the Vikings, the RTGs will generate more heat to keep things inside the lander "cozy," a term that Dr. James E. Tillman used to describe the temperature inside.  He asserted that an astronaut in a pressure suit would be comfortable with the temperature inside. The exact definition of "cozy" is not yet known; but let us assume that it is 20 degrees Celsius (68 degrees Fahrenheit).  That would be 293.15 K. Now, suppose the starting pressure is 8 mbar. If the air In a transducer behind a clog due to dust were simply allowed to cool by 10 K, the pressure there would drop to 7.7274 mbar.  But if an RTG kicked on to raise the temperature by 10 K at the transducer, then the pressure there would rise to 8.2729 mbar. When the heater turned off and allowed temperatures to start falling again at the transducer, we would expect to see the pressure start to fall again.  This is a pattern often seen at the Vikings.  For an on-line calculator that allows you to see how pressures vary with absolute Temperature, see Gay-Lussac Calculator by Software Systems.