Despite their airy and weightless appearance, clouds are actually insanely heavy. According to scientists, 1.1 million pounds is the average. That is the equivalent to 100 elephants. So, yeah, you’re probably wondering how these things stay afloat. It’s because the weight is spread out into millions of droplets over a really big space. Some of these droplets are so small that you would need a million to make a single raindrop.