Need more detailed info on rainy season in Bolivia.

I will be in La Paz, Sucre, and Potosi in the end of January and the beginning of February. I have read the post about the weather this time of year and I have looked up climatic info on the web. Could someone give me a better description of how the weather is this time of year. I see the rainfall charts in milimiters but what are the days actually like this time of year. Is it cloudy all day? Can you see the mountains? Does the rain come in downpours or is it a continuous drizzle? What percentage of the days is it rainy? I will be flying between La Paz, Sucre, and Santa Cruz. Most of my touring will be in the cities and may be out to Copacobana. Any info is appreciated.