In reply to Swampi:
It's only just a La Ni£a at the moment, from what can tell, globally (it's a big deal here in Australia as it makes for a wet summer, and El Ni£o causes us droughts). It's not as strong as the La Ni£a around 2010-11.
The previous big one before that, around 1998, made the Andes extremely dry and some Bolivian peaks were totally devoid of snow. I doubt this one will be like that (and by 1999 they'd recovered completely). The Blanca is melting anyway, and a friend who was climbing there, and in the Huayhuash in August, said it was very bare then, but to me his photos didn't look too bad. I've seen pics of Artesonraju looking worse.
July-August is late to be there though, nowadays, and even more so in a La Ni£a year. June would be better, but it's always a gamble any year.
Edit: Just to add, and maybe contradict myself - the southern Andes, TdF and Antarctic Peninsula are having an unusually clear, sunny and warm period of weather at the moment, so that does lean toward a La Niña in progress.
Post edited at 21:11