We have quite mild winters where I live, it’s rare to go below 0C. With the heater blasting it will happily do 220 km around town, or 150 km at highway speeds. We definitely notice the range reduction in winter. In the warmer months it does 270 km around town, 200+ km on the highway.
We have the perfect use case for a Leaf: 90% of our driving is around town under 70 km/h (45 mph) , and we can easily charge overnight at home. So we never had much range anxiety to begin with. Every now and then we will purposefully take it on a longer trip just so we can learn how things like speed and temperature affect the range. But for our daily driving we don’t even think about range.
I think the best thing you could do for yourself if you’re considering a Leaf is test drive one. Take it on the highway for 15 minutes and get a feel for how quickly the range drops. Find a public charger and see how much range it adds in 5-10 minutes. The Leaf may be perfect for me, but I’m just a stranger on the internet who (probably) does very different types of driving to you.