How can there be snow on the equator in Africa? Is it even possible?

The higher you are the colder it is, and in normal conditions the change is 3 Degrees F per 1000 feet. 30 Degrees per 10,000 feet, 60 degrees per 20,000 feet, and 90 Degrees per 30,000 feet. So on a cool day at the Equator, snow would fall on mount Everest sized mountains.