Averages can only tell you so much, and that’s quite little. As “global warming” is based on worldwide averages, it should be then always looked at judiciously and with a good deal of curiosity to figure out what is happening above and beyond the simple figure that is an average temperature.
Say, one lives in Placeville, a town where it’s -20C in January, +20C in July. Average is zero C (32F).
Imagine now, winters warm by 10C, summers cool by 5C. So it’s -10C in January, +15C in July. Average is 2.5C (36.5F).
Headline news: “Placeville heavily hit by global warming, average temperatures up by 2.5C“. When the real-life news is, it’s much cooler than before: still very cold in January, and now not even warm in July.
This is such a simple concept, I am always amazed how many people don’t get it. But then few grasp the most elemental aspects of statistics. And I wish three people in the world understood what “global warming” might be about.