Something you learn in the Southwest US is that there are certain signs of coming monsoon season. I listen every day for the sound of locusts screaming. Today, the locusts screamed! That means the humidity is going up and monsoon season is about to begin. How far did the humidity go up? From about 4% to 14% but when it's 110 outside, you seriously feel it. The dewpoint will need to stay about 55 for about 3 days in a row for us to produce any rain here.
Another way to know if it's going to rain is the creosote scent. With enough moisture and impending rain, creosote bushes release a smell that's somewhere between pine trees and good old fashioned bar soap.
Once the rains come, the sage bushes blossom and crazy desert frogs erupt from pools of water, having waited in a dormant state for a reason to exist again.
I am such a rain lover that the first monsoon rain of the season, I dance naked in the rain and give thanks.