Steps to reproduce: simply try to use it
How to fix it:

1. in fn_WeatherModule.sqf simply remove
   waitUntil {!isNull findDisplay 46};
   of replace it with
   if (hasInterface) then {waitUntil {!isNull findDisplay 46};};
2. in fn_SetRealtimeWeather.sqf (line 249) simply remove
   waitUntil {!isNull findDisplay 46};
   of replace it with
   if (hasInterface) then {waitUntil {!isNull findDisplay 46};};

Ok thanks for the heads up! I really appreciate it.
My update tonight should fix those issues

No problem ^^ It's been an honor to help an other developer fixing his issues ^^ +1

As soon as I try to join my own dedicated server I get this:
"Wrong signature for file D:\Program Files\Steam\steamapps\common\Arma 3\!Workshop\@Real World Weather\addons\hz_realworldweather.pbo"
I have copied the same folder from workshop to server. Key is in key folder.

Hortzy, we run a server 24/7 and we see the weather changing as per METAR/TAF. Thats great. However, eventhough we have set humidity to 'false' the fog seems to get denser all the time regardless. Right now humidity is 77% in Helsinki but visibility is 10+km however in Arma it seems no more than 3 KM. (yes my viewdistance is all the way up). When I manually set fog to 0, it clears up but the next day its down to foggy again.

Having issues with server:
Error in log: Call extension 'url_fetch' could not be loaded: The specified module could not be found.
I unloaded all mods, created a basic mission with the module, put it on the dedicated server, with only this mod loading and it still doesn't work.
I can get the menu through script but it is blank.
I can fill in the information and populate and the menu appears correct but the scene doesn't change.

I fixed my issue by installing Visual C++ Redistributable for Visual Studio 2015 found here:
https://www.microsoft.com/en-us/download/details.aspx?id=48145