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Stephen Wilde says:
Solar activity has not been especially low since we have just passed the peak of cycle 24.
The best I feel able to say is that across multiple solar cycles the balance between El Nino and La Nina will gradually change in favour of La Nina when solar activity is declining whereas that balance will gradually change in favour of El Nino when solar activity is increasing.
The interesting feature of the current strong El Nino will be the extent to which it affects average global surface temperatures.
At a time of less active sun and a cloudier Earth (as observed) this El Nino should have a smaller effect than did the El Nino of 1997/8 even if it is of much the same intensity.
Not sure if you have seen this...Here is the Los Angeles/Oxnard NWS discussion about the upcoming El Nino: