Here is the annual cycle of air temperature at Quelccaya (5,680 m), based upon the best dataset available. Each mean daily value is based upon ~4 years of measurements, which are not contiguous due to a power problem in 2010-12; the record has been smoothed slightly for clarity. A previous post (available here) provides some background, and the data will be available here shortly.
Analyses of these and other Quelccaya data are gearing up, working towards publication of a Quelccaya climatology. As illustrated by this graph, some interesting patterns are emerging.
[UPDATE 3/25: A complete record of quality-controlled hourly air temperatures for July 2007-June 2009 are available here, as well as the accompanying metadata.]
