If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Llano de Los Patos: The hottest months are usually March and April, with an average temperature of 29°C, while the coldest months are December and January, with an average of 27°C. The rainiest months in Llano de Los Patos are October, June, September and May, with each month seeing an average of 366 mm of rainfall.