Every country has unique aspects. Good and bad. Generally speaking, Portugal has overwhelmingly agreed with us.
When we first visited, I was amazed to see that most dwellings did not have heat or A/C. Our first visit was in February and March. There were space heaters in our first Airbnb, and they were all we needed to be comfortable.
I took this to mean the weather is so mild that outside climate control is more of an option than a necessity. And in general, that is the case. This depends, of course, on which part of the country you want to inhabit. It snows, and there is skiing in Serra de Estrella, and it gets wicked hot in the south and interior parts of the country.
In fact, we went almost three years with only a couple of space heaters, which were quite adequate.
This brings to mind the phrase, average temperatures. One should ask, what are the extreme temps? And gauge accordingly.
We bought a flat in Porto, and the first winter was anything but average. In December, the worst cold snap in 30 years came along. For the first time, our space heaters were not enough. We froze our asses off and racked up 350+euro electric bills. (Which usually run about 60-90 euros.) Ugh. Temporary, right? I am thinking there is some form of permanent heating in our future.
I have read that many ex-pats choose Lisbon and points south because Porto and environs can be cold and rainy in the winter. The weather is Seattle-like here in the winter and, I am ok with it. The heat is what I hate. And happily, it is very moderate in the summer.

On a lighter note, here are some odd but amusing observations.
Giant mutant seagulls. Yup, they grow them big here. Apparently, the Atlantic seagull is one of the largest varieties. And they rule the coasts.
They are enormous compared to the gulls I grew up with in California.
They are also pretty bold and like to perch on cars. I do not know why, but I think it is hilarious. They are also notorious trash pickers. If you see trash strewn all over the street near a dumpster, it was probably seagulls.
I have seen them in action. One day, I almost got brained by a walnut that a seagull dropped while it was flying overhead. Retribution for closing the lid of a dumpster that they were raiding, I am guessing.

The Obamas put the Portuguese water dog in the spotlight when they had one in the White House. The funny thing is, I have never seen one here. However, the Portuguese Podengo is very popular. And no one has ever heard of this breed in the states. The Podengo is a hunting hound dog that varies from small to large in size. They are adorable and intelligent. And, I am told, they are very Jack Russel-like in temperament. This means they are a handful and not for the faint of heart or dog novice.
Independent and intelligent dogs require a lot of interaction and training.

There are many fascinating differences between Portugal and the states. And many similarities. One could write a book about driving in Portugal and Europe in general, for example. Parking on the sidewalk is quite common. You see this in Italy as well. Lack of space explains it.

European cities are ancient, small, and compact. Parking is a much more recent concern.
And the Portuguese love their cars. Since I am originally from L.A., I can relate to this. I have always loved cars but, at the same time, I do not miss having one. The cost is one reason. And then there is the parking. Good luck with that. However, I am amazed at how many huge garages there are in Porto. They have small entrances, so you would not notice them at a glance. But they contain cavernous spaces that hold scores of cars. This is crafty because even parking a Smart car on the street can be a challenge. I say, forget about it and take the metro!