We only have two snake species here - European Viper (Vipera Berus) and the Grass snake (natrix natrix), the Viper being the only poisonous one of those, and even then, only really dangerous to people who are allergic to it. For most people the bite only gives you discomfort and swelling. But I've found that they are more prone to bite when it isn't that hot. In the sluggish state they aren't able to escape as easily, so they attack instead. When it's hotter, you usually don't even notice them, they just move out of the way.
The better half was actually bitten by one last summer at our cottage. She wen't out for a quick pee in the bush, and noticed a bit of a sting in her rear end while crouching. When she came in, it started throbbing, and she noticed a double puncture wound there. She took some hydrocortizone and had a bit of a hangoverlike feeling and a stiff leg the next day, but other than she was fine.