Here in central California chemtrails have been fairly rare for the last three months. Most jet aircraft going overhead have no trails whatsoever. There is a pattern though. Whenever there is a possibility of rain, single chemtrails appear. There was one last night right after sunset, illuminated by the half moon.

I think that they're trying to maintain a certain level of nano-particulates in the upper atmosphere to accomplish their goals. The Ridiculously Resilient Ridge phenomenon is still active in the northeast Pacific, acting as a barrier to weather systems approaching the U.S. west coast. I'm almost certain that geoengineering aerosols sprayed over the western U.S., the Ridiculously Resilient Ridge and the California drought are all related.