The question is how often is cloud seeding done?
It is relatively rare these days in most of the US.
Here is an article from 2021 suggesting it was limited to eight states during one drought period:
https://www.scientificamerican.com/article/eight-states-are-seeding-clouds-to-overcome-megadrought/
In addition chemtrails supposedly use aluminum which is not a chemical used in cloud seeding.
Still fairly common...here is one of the companies (out of Reno, NV) doing it for SMUD/PG&E/SoCal Edison (and you don’t even need airplanes):
https://www.skywaterventures.com/ground-based-seeding.html
https://www.skywaterventures.com/aircraft-seeding.html
https://abc7.com/southern-california-water-cloud-seeding-riverside-county-inland-empire/14341706/
Farmers can get pretty innovative in their “weather modification” tech (more rain/less hail)....check out this video from near FR HQ:
https://youtu.be/rVgnGMDbjQE?si=NDSHskR1yuhqITiS