Martian surface temperatures vary from lows of about −140 °C (−220 °F) during the polar winters to highs of up to 20 °C (68 °F) in summers.
- Haberle, R. M.; et al. (2001). "On the possibility of liquid water on present-day Mars". J. Geophys. Res.. http://www.agu.org/pubs/crossref/2001/2000JE001360.shtml. Retrieved on 2006-10-06. 106(E10), 23,317–23,326. (abstract, full paper requires purchase or AGU subscription)
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