You can find the average temperatures for most places on earth at:

http://www.worldclimate.com/climate/index.htm

So haul out a map and plug some in.
I tried a few places for the average temperature and found that most are around 80 degrees F.Nairobi, which is at a higher elevation, has an average around 65 degree F. Things are warm around the equator because the sun's rays hit more directly there. At the poles, the light hits at sharp angle, so it's a lot colder.

You'll also notice that the temperature is about the same all year. Any ideas why?

If you get interested in the temperatures for places all over the globe, start looking for patterns. Here are some hints: elevation, latitude, nearness to oceans or big lakes.