Almost every station in the list is below normal for 2012:
http://www.meteochile.cl/precipitacion.html{Note: the table in the link will be overwritten in about 18 hours' time}
The nil rainfall for Arica is not unusual (or for Iquique), as it;s the world's driest significant city - very long term average < 1mm/year. But in the last 15 years or so it has had several "wet" ones, with 9.3mm in 2002, and its aveage over that period has been 1.7mm, against a 30-year mean of only 0.5mm 1961-1990.