The difference between there and almost there....

So it turns out that the difference between an electronics-enclosure rating of IP55 ("protected against harmful dust ingress and against being sprayed with jets of water") and "can leave it out in the rain today" is about a tablespoon of muddy water that poured out of my electric-car charger this evening when I opened it to see why the car wasn't charging.

Oops. Sigh.