I think (purely personal opinion here, no scientific backing whatsoever!) it might be related to the humidity of the air.

I'm a frequent victim of the bite of the dreaded static electricity charge. I've noticed though that I get shocked more often during colder, drier months than the warmer, more humid summer months.

In the summertime, I don't get shocked at all. Fall into winter, it's like shock therapy getting out of the car.

What I've been doing is while seated, I make contact with the metal side-sills of the car. I then touch the doors and continue touching the doors while I get out.

I'd sometimes forget to do this though, especially when in a hurry. So I still get shocked occasionally!

:lol: