A cold and wet Mars

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Outgassing History and Escape of the Martian Atmosphere and Water Inventory (2015, background): “On the other hand aqueous solutions with lower melting points may have existed (e.g., Fairén, 2010, and references therein; Möhlmann 2012) making it possible that Mars might have been “cold-and-wet” with average surface temperatures of ∼245 K (Fairén 2010; Gaidos and Marion 2003).”
Geologic Constraints on Early Mars Climate (2018, unknown): “Indeed, the data can be matched with Tav ≲ -13 °C (Fairén 2010).”
3D modelling of the early Martian Climate under a denser CO2 atmosphere: Temperatures and CO2 ice clouds. (2012, background): “Erosion and surface alteration may have occurred by saline and acidic liquid solutions (brines) which can be stable at sub-zero temperatur s (Fairen, 2010).”
The Climate of Early Mars (2016, background): “…can combine to create marginally warm conditions and hence small amounts of episodic melting (Richardson & Mischna 2005; Wordsworth et al. 2013; Kite et al. 2013; Mischna et al. 2013; Wordsworth et al. 2015), particularly if the meltwater is assumed to be briny (Fairén et al. 2009; Fairén 2010).”