I think some days the atmosphere has high humidity, and the change in temperature in jet contrails causes them to condense.
I think other days the atmosphere has low humidity. The change in temperatures in jet contrails on those days, does not generate as much condensation.
Pretty simple.
Here’s something else that’s simple. Jets don’t fly low altitude criss cross maneuvers with each other over urban areas. Sometimes they are flying low enough that you can see its not a jet. I have watched a plane flying low enough that I could see it was a tanker with 4 spray nozzles. I watched the spray turn off for a minute then turn back on.
My personal opinion is that they have screwed around with this stuff so long now that if they don’t spray it doesn’t rain. Remember when you were a kid? Sometimes it didn’t rain for 10 days or more. Now if you watch WeatherBug you get 2-3 sunny days then a rainy day then several sunny days and then a couple of rainy days. Last June that HAARP program was shut down. So for about a month there was no spraying. It hardly rained. Then all of a sudden they started it back up again. They are spraying aluminum, barium, copper sulfate, potassium iodide and strontium. It creates cloud cover.
This chemtrail stuff is the most egregious case of hiding in plain sight I have ever seen.
Sorta like some days I can see my breath and some days I can’t.
Hey stupid, open your eyes. Do a little study because the proof is already out. They are spray the skies.
https://geoengineering.environment.harvard.edu/
http://environment.harvard.edu/geoengineering-science-governance