@FDF Okay I think I have messed this up really badly.
I looked through synaptic for the package of the applet and whenever I type "weather" and "cinnamon" nothing shows up. When I look up "weather" other weather applets show up, for MATE Desktop and Gnome and also some lib packages which are indicated to be installed. When I look up "cinnamon" all the other applets I show up except for the weather applet. So it seems like I had not installed the weather applet from synaptic after all facepalm). I know I installed it from the site but then deleted the files and was convinced that I uninstalled it, but that's not the case... its real confusing.
I have also come to realize that to uninstall the applet I was supposed to run the uninstall.sh file in the directory, I had however looked for the weather@mockturtl directory and delete it, as that's how you normally uninstall the applets. I therefore think I have really messed the applet up, I've tried to look up it's components but only know of the "cinnamon-weather-settings" launcher and the directory I mentioned beforehand. I therefore cannot properly delete the applet, I've even tried with the "uninstall.sh" in slight hope that it might just work a miracle, it did work to some extent, but the applet still remains in the list although it fails to load details. I ended up just trying to install the applet again in hopes that with use of the "cleanup.sh" and "install.sh" the broken applet may be overwritten by the new one or at least there may be a duplicate that would work perfectly. However, there is still one weather applet in the list and it works perfectly well if only I stay in Innsbruk
I think the problem is that the "cinnamon-weather-settings" component of the applet is missing which is why the applet fails to access it, I also can not open it through terminal but if I type "whereis cinnamon-weather-settings" it points me to the file "/usr/local/bin/cinnamon-weather-settings" which is a shortcut file pointing to "/root/.local/share/cinnamon/applet..." A directory I had previously deleted in an attempt to uninstall the applet. I really have messed this one up now, I'm not sure what to do...
@Fornhamfred To install the applet, you need to run the "install.sh" file (preferably "run in terminal so you can see what it's doing" otherwise you can just run it.) So assuming you had no earlier version of the applet you just double click the "install.sh" file and it will ask you to either "run it in terminal" or just "run" it or "display" the source code. You can then just choose to run it in terminal or just run it. I would advise you however to check these instructions with other more experienced users than me since I'm having problems and may have missed something out.
Just an update, I have found the "/root/.local/share/cinnamon/applets/weather@mockturtl/cinnamon-weather-settings" file. When I launch it from its location it loads and runs fine. Its settings however are not in sync with the applet, and any changes I make are not applied to the applet. I therefore think that the applet is pointed to the wrong location for the "cinnamon-weather-settings", its probably pointed to the shortcut file which doesn't launch, so I'm going to try and copy the working file to "/usr/local/bin/cinnamon-weather-settings" and overwrite the shortcut. I'll give feedback on what happens...