When the air temperature is cold, the saturation vapour pressure of water decreases – making it easier to precipitate. That is why wet weather tends to occur when it is cold.
California gets almost no precipitation during the summer, despite the fact that there is more moisture in the air than in winter. Climatologists who claim that recent heavy precipitation is due to warming temperatures, are wrong on all counts.
It is amazing that some PhD’s can have so little understanding of the fundamentals of their degreed profession.