The identity of the La Nina event features colder than normal Sea Surface Temperatures (SST) in the eastern and central Equatorial Pacific, these anomalies will be reflected in cooler sub-surface temperatures and the pressure patterns are normal, meaning that the oscillation feature is absent.
Weather patterns around the southern hemisphere will react accordingly. The tele-connexion ability of global climate-cum-weather is axiomatic: one cannot have two-left legs, so as to speak.

Third article in a series that discusses the technical aspects of rainfall
World-wide, the climatological approach to the rainfall factor of the weather world is to collect the monthly detail, total it, and compare it to the long-term detail: the mean, write an interpretation of this figure and then publish it. This methodology works satisfactorily where rainfall occurs in a very reliable fashion, on an almost daily basis.