Slide 9 in this series.
El Nino is diagramtically shown below, and how the warmer water in the ocean, part of the southern oscillation in the Pacific Ocean can function. Warmer water at the surface can lead to higher rainfall as well as raising temperature even on land.
The ENSO effects on temperature is our next stop.
These links are the topics for this section.
Modelling Temp Natural Factors
Earth and the Science of Radiation
Milankovith Overlapping Cycles