There are other threads on this that might have some answers, and at least one thread about upgrading the radio. If you're serious about that, look for the thread, because it may be a solved problem
I don't reckon it's that bad, but I do know what you mean. When I was given a Peugeot e208 as a courtesy car I thought it was a boring wee thing but I had to admit the radio sounded better. I use FM most of the time because where I live is in a DAB blackspot, but I sometimes switch to DAB if I'm somewhere where FM is poor. Usually one is better than the other, but only rarely is one or the other unobtainable.
In the SE, external temperature was there up to and including version R13 of the infotainment software. Then a bug was introduced with R16 which removed it. R21 didn't restore it, but then R33 did. Lots of people on R13 refusing to allow updates until the external temperature was guaranteed not to be removed!
If you don't have an external temperature display you do not have the most up to date software and you need to complain (bitterly) to your dealer. R33 is very much better than its predecessors in a lot of ways (for a start, the USB player works), and you want it. Complaining about the external temperature should be enough to get you it though.