I have noticed this when the air is hot & dry out, my pv has less vapor, vs, whenever it is humid, I get better vapor

(UNLESS ofcourse, it has rained. After a good rain and the humidity has gone higher, then I get as much vapor outside as I do inside. I
I also have a large 55 gal. aquarium that add's more humidity and plus I'm running swamp cooler indoors. Seems that humidly plays a role in this.
Someone else one the forum mentioned they noticed more vapor outside on the balcony next to the ocean, and said there was less vapor each time they went indoors, than outside