If you don't know that 34F is approximately 1C, that's a you problem. It doesn’t require any mental math to observe that 34 is marginally greater than 32, which is the freezing point of water in Fahrenheit.
I've definitely seen the comparison made, on random US articles which almost invariably show °C as well as °F, but I'm not sure that if someone asked me if I would recall the answer.
I know that 100°F is something close to 37°C, and I'll probably not forget 32°F for a while now. But it's fairly useless trivia as far as every day life goes.