(Granted, California is large and has several different climate zones. If I get to it I'll look at some specific weather stations.) (But I probably won't get to it.)
Overall the continental US had its 11th warmest July (NOAA). Its 30-year warming trend is +0.28 °C/dec (+0.51 °F/dec).
--NASA's Carbon Monitoring System (CMS) has been cancelled, assumedly by the White House. But it hadn't been funded by Congress. It cost $10 M/yr. A scientist said, "If you cannot measure emissions reductions, you cannot be confident that countries are adhering to the [Paris] agreement." But how accurately can emissions be measured from space? I'm dubious.
--Climate Researchers Warn Only Hope For Humanity Now Lies In Possibility They Making All Of This Up (The Onion)
--A satellite picture of smoke over USA48, via the HERR model. Via Eric Snodgrass's weekly discussion of Pacific NW weather. (I don't know what the units of the scale are.)