February until mid-March is rainy season in Bolivia. You will get a few windows of good weather, but will be a hit & miss type thing. However, reportedly this year the area is getting a lower rain fall than usual, a drought in South western Bolivia and northern Argentina along with high temperatures affecting cattle and other animals.
Last year about the same period of time I was riding to Toro-Toro (in the province of Potosi) and we encountered lots of water and mud. Had a hard time on those river bed roads. I hope this helps.
Have fun and ride safe!
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