How much does a cumulus cloud weigh

How much does the average cumulus cloud weigh? I watch one glide across the sky at sloth speed It is fluffy, white and porous with a shine of light blue Dainty and light, it weighs maybe six pounds I guess The scientist visiting me laughs. An average cumulus cloud weighs as much as one hundred elephants. She is kidding, right? I stare at the cloud, astounded. As soon as this know-it-all leaves, I plan to look this up.