Asklemmy

116 °F (47 °C) during the 2021 Western North America heat wave
7 °F (-14 °C) in Mammoth Lakes, CA

Hottest was around 50°C, which was surprisingly bearable but I do like warmth, so there's that.

Coldest around -10°C, and hated every second of it. Cold is my arch nemesis.

German here.

hottest: 42°C in summer 2003. there have probably been warmer days by now, but I'm not aware of any.

coldest: -14°C in winter 2009/2010, while waiting for an absolute asshole of a bus driver to stop reading his news paper and finally open the door to let us in. I get that you want to enjoy your break in silence, but ffs. Leaving us waiting in such cold temperatures for around 10 minutes was just inhumane.

I slept in a tent in 2°F(-16.6°C) weather, I've probably been in slightly colder but not while sleeping.

Hottest was 117°F(47.2°C, last year in my home town it was +110°F for over two weeks straight.

Hottest: +40C

Coldest: -40C

I think that's exactly it, which is nice and round. The 40 above was in the US, the 40 below was the coldest it's ever been at night here. Without windchill, mind you. Windchill is cheating. With windchill it can get close to -100C on those same days.

-40, 50 I think (Celsius)

Hottest was 122°F (50°C), a record heat day in Mesa, AZ.

Coldest was in Indiana during the polar vortex of 2019, -45°F (-42°C).

The world is a crazy fucking place.

do birds fly? do ducks duck?

Hottest was 100F, thought I was going to melt. Coldest was -30F with windchill, ambient air temp without wind was -6. Honeslty I'd take -30 again anyday over 100. I can layer for the cold, at 100 I wanted to take my damn skin off.

This week will hit 48c so that'll be fun Coldest I've been was Wyoming -40c with 55mph winds I was a meat popsicle on a horse.

Hottest: 42C humid - horrible sensation, would never want to experience it again, but looks like we're almost there again
Coldest: -27C - wasn't nice, but not worse than -15C with high winds!

(both in Romania)

113F in Dallas Tx, in 1980.
-15F in [the former west] Germany, Jan 1985

Arizona desert during the summer. Winter Storm in Wyoming.

116°F driving through Arizona in July 2007, could've been worse if it wasn't a dry heat. (46.7°C)

10°F Central Texas Feb 2021, had no power, so had no running heater at home. (-12°C)

hottest was 47°C and coldest around -10°C (which felt too cold for me haha, it's crazy to me that people can survive with temps like -20°C and lower :ρ)

Hottest temperature would probably be around 45°C (desert) and coldest below -50°C (Siberia).

hottest: 39C coldest: -28C

-30 F or thereabouts and maybe 115 F or so.

Hottest? Last summer, driving home, Dallas-Fort Worth metroplex area. The A/C in the car I was driving was busted, it had zero window tint and a plexiglas roof panel so there was no shade whatsoever. The area was getting that extremely dry late-summer heat that area gets during made worse by the heat dome effect over the city. The actual temp was likely 108°-110°F, but the "feels like" was somewhere in the upper 120°s. Add to that the fact that the wind itself was literally hot, and there I was driving down the highway with my windows down cooking in what basically amounted to a convection oven. I ended up finding that I was actually cooler if I rolled the windows up. When I got home my shirt was totally soaked and as a result, it has the shadow of a seatbelt burned into it.

Coldest? Around -20°F in central Utah during winter at about 3AM during an impromptu snowball fight in the apartment complex I lived in. Zero wind and about a foot of snow on the ground. Again, surprisingly dry, so it was legitimately PLEASANT with a ski jacket, long johns and jeans, when compared to a humid, windy winter as warm as 32°F anywhere else in the same gear, but definitely the coldest temperature I've seen by the numbers.

I cannot say the coldest temperature, but I know it was most certainly one of the klondike derby campouts I did back when I was in scouts. I had to look it up, and my city apparently usually has an average overnight temperature in December at 21.6°F, so I imagine out in the campgrounds it's colder since it is further away from any towns/cities.

As for hottest, it got somewhere around 98°F where I live this week, so I'm going with that since I cannot accurately say what the hottest I've dealt with outside is.

Hottest would be 49°C in Marrakech, in the middle of August. I remember Moroccans talking about how hot it was, and a big thunderstorm broke that evening with torrential rain.

Coldest would be at home in the UK. Probably the coldest I've experienced would be about -7°C, that's pretty extreme where I am though and it would be the night time temperature. I remember a few years ago going clubbing in winter and someone robbed my coat, I had to walk home at 3am in about -3°C with my friends trying to keep me warm. Not fun.

Hottest? No idea. I've never liked the heat and avoid it when I can.

Coldest? Easy. Forty feet (12 meters) up on top of a jet fuel tank in Thule, Greenland helping to change the cover on an automatic tank gauge. It was in the -40s on the ground (doesn't matter which scale) and windy. I don't know how much colder it was on top of the tank, but it was certainly colder than it was on the ground.

I live in southern california, so it doesn't really dip below 40 F. One time it got to 109 degrees here but the actual hottest I was was during a trip to Florida. 115 and humid.

Coldest and hottest in my own country (UK) that I've experienced are -14°C and 40°C. -14 was fine but 40 was hell.

40°C - Malta holiday.
-21°C - Kasprowy Wierch hike.