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While it doesn't mention lower limits, the user guide specifies the max operating temp for the Kobo is supposed to be 45c.
One thing to remember about E-ink though is that one of the components of the tech is a liquid (oil to be exact), and like most liquids, expose it to cold enough temperatures, it will freeze. So if you're seeing faded, slower responding text, or ghosting, then chances are you're starting to see the oil solidify, preventing the proper colored pigment to flow through. Not sure what ype of oil its using, but I figure it some sort of mineral oil mix; while mineral oil freezes at -30c, it viscocity starts to degrade/increase below 10C.
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