La Paz – Bolivia’s largest city and centre for commerce, finance and industry – is the governmental (some say ‘de facto’) capital. Meanwhile, El Alto is the Aymará capital of the world. Although in reality an extension of urban La Paz, El Alto’s ongoing influx of immigrants – mostly looking for work – means it has morphed into one of Latin America’s fastest growing cities.
La Paz is dizzying in every respect, not only for its well-publicized altitude (3660m), but for its quirky beauty. Since La Paz is sky-high, warm clothing is desirable most of the year, at least in the evenings. In summer (November to April) the climate can be harsh: rain falls most afternoons, the canyon may fill with clouds and steep streets often become torrents of runoff. In winter (May to October) days can be slightly cooler, but the sun (and its UV rays) is strong and temperatures reach the high 60s, but at night it often dips below freezing. Read more: http://www.lonelyplanet.com/bolivia/la-paz/introduction#ixzz4NKWs6i71