Where is San Jose's rainfall measured and how does it differ from west San Jose and Saratoga?

San Jose's rainfall is measured at Mineta San Jose International Airport. In order to produce rain you need moisture, in the form of humidity, and rising air. Rainfall amounts at Mineta San Jose International tend to be less than Saratoga and neighborhoods in west San Jose. The majority of our storms cross the Santa Cruz Mountains. After air crosses the higher terrain it descends into the Santa Clara Valley and stabilizes the atmosphere, choking the storms and making it harder to produce rain.

Appreciate the question.

Take care,

Mike