I think it is called a Euphorbia Lactea, but I'm not too sure as it's a while ago since I got it and when I google the name it looks different from what I have so, it could be anything.
We do get snow here, and it rains from November pretty heavy, I live near a river and that sometimes bursts its banks.
when I go to see my mum next I'll take a photo of it and send it to you so you can have a look, she's away at the minute for a week, otherwise I'd ask her to send me a picture :D
Ohhh Euphorbias are African cacti. I don't know much about them, so better don't do what I told you :P
I have two and one is outside with other cacti, gets the same treatment and it does bloom, and the other one is inside and never bloomed. They have tiny flowers - nothing special. But better read about it first before you kill it :p