Winds are likely in Patagonia, but I saw people riding in those winds on bicycles, so I figured I had it easy. Just don't get uppity--people do crash in the winds--and take extra gasoline to account for fuel consumption skyrocketing.
A couple of months is plenty of time for the entire Ruta 40. If you included March you could take every side trip, use frequent rest days, and drink lots of  along the way. Easy enough to start from the Bolivia border, ride to Ushuaia, double back along Ruta 5/Caraterra Austral, and throw in an Andean pass or two or three. The ones in the north are fun and interesting.
Weather is indeed variable. At that time of year, very little will be intolerable.
Getting to and from B.A. by road is a bit annoying. Consider Santiago instead, at least for beginning or ending.
Hope that's helpful.
Mark
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