Personal low was -25 - school was called off due to the cold but my brother and I still went outside to play (the wind was almost nonexistent thankfully.)
High? Somewhere over 100 since I’ve experienced it in Florida. I’d have to guess that it was in the upper 100s in Las Vegas when I visited one summer since it was still unbearably hot in the morning just after dawn.
Heh, that’s actually the highest I can confirm- I was camping in Joensuu the week the record was set there.
I’m pretty sure I’ve experienced higher temperatures while in Australia, but I didn’t have a thermometer, and by local standards it was nothing special. I think I got over 40C at least once though.