Thunderstorms especially so. In winter, the biggest reason is terrain and elevation. Paradise and Magalia are the worst problem cities for this. No matter what is reported, there will always be a different temperature or rainfall somewhere in your town, or at your own home. This is the same effect that the Santa Ana winds of Southern California have.
Lower elevation means higher air pressure.
That's why bicycle pumps get hot after awhile and aerosol cans get cold. The Heat Index. Sometimes its the heat and humidity combined. See this Heat Index Table I made up. I figure I've been asked this question 1,237,486 times during my career, so its time for a new question.