By this time on last year we were in Uspallata/Mendoza and we cross a Brazilian couple on a G650 who just comes from Chile and they told us that were very cold but perfectly rideable, they were 2 days on the Chilean side waiting for the pass reopen and be clean.
For Brazilians 20ºC is F.. Cold... 
If its open avoid the extreme hours, do the cross to be up at midday and only just be careful with ice on the dark curves.
If you continue north by Chile side you will miss the best of Argentina, Mendoza and farther north till Bolivia border; the Ruta 40 and all what we call the NOA.
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