> It would be quite educational to attribute in more detail the impact of these two factors. The degree of "El Nino" influence is presumably known, and if its strength is not related with global warming in complicated and unknown ways it would be good to overlay it as a distinct effect.

I've seen some attempts to quantify the difference. E.g. this article tries to illustrate it: https://theconversation.com/july-was-earths-hottest-month-on...