I'm from California, too. I lived in Nevada for a few years, also, low humidity in both places. Cleaned my tools with laquer thinner just about every night. Then I moved to Houston, TX. After I was here about three weeks we had a stretch of 100% humidity days with big temperature swings. Had a three day weekend and came in to a toolbox full of rusty tools!

I just lightly wipe 'em down now, if it is something that I don't use much, or has a black oxide finish, or has been previously rusted to pits, I just stick it in the drawer as long as as it is not totally nasty. I buy a lot of used tools from pawn shops and flea markets so I have a few tools that show signs of having previously been rusted. Back home tools like that would invite comments about how you care for your tools, here, not so much.