Best weather for 100 days of riding S.America?

[srileo]

All,
i hope this topic has not already come up on this forum.

I plan to fly and ride my motorcycle from Buenos Aires to Colombia from Mid-End September through to December this year. I am planning on a 100 days.

Could you comment on the weather possibilities for the timeframe i have in mind?

Mid-Sept for about 10 days: buenos aires to Mendoza (going straight east, avoiding TDF and southern patagonia for lack of time)
Early October to Mid October: Northern patagonian chile up to Bolivian border
Mid-October to Early November: Bolivia off-road
Most of November: Peru, offroad as much as possible
Early December: Equador
Mid december to Late december: Colombia
End of December: return to USA

I'd appreciate any alternate suggestions if it gives me a consistently better window of weather. I am not averse to cold and wet, just hoping that the off-roading that i anticipate in Peru and bolivia will not be met with too many mudslides.