Differing values have been reported for the average temperature on Mars, with a common value being −55 °C (−67 °F). Surface temperatures may reach a high of about 20 °C (68 °F) at noon, at the equator, and a low of about −153 °C (−243 °F) at the poles. http://en.wikipedia.org/wiki/Climate_of_Mars
As our planet have seasons also mars have seasons, I don't know which part of mars they've been tested but I'm think where rover is. So it's make sense.
It's can only say one thing Canadians can live on mars...
Probably not totally accurate, but it was funny, which is why I come to the site ;)
Differing values have been reported for the average temperature on Mars, with a common value being −55 °C (−67 °F). Surface temperatures may reach a high of about 20 °C (68 °F) at noon, at the equator, and a low of about −153 °C (−243 °F) at the poles.
http://en.wikipedia.org/wiki/Climate_of_Mars