Back in 2010 I was doing a, sort of, mini marathon ERT on Anubis (Plopsaland De Panne) with a friend of mine. Yeah, it was raining whole the time and I made about 40 laps ore so. I just had to stop because I wasn't feeling my face anymore... And It was freezing cold.
Also, not so long ago in april i've ridden Stealth in Thorpe park for the very first time. It was just starting to snow heavily right before we where launched. And I was sitting front seat. I thought the ride was awesome, but then again I was crying like a little baby because of all the snow that jammed into my face at that speed .
When it's raining, I prefer to ride Wooden Rollercoasters. Man, they are wild at that moment, so lovely *airtime all the way!*