i don't know the Code of your city.. but just go to weather.yahoo.com, search for your city and than you need the numbers at the end of the url. (like you see on the picture) Like for me its 551219. if you use the clock with groovylock i did it that way
- install groovylock from cydia
- than i copy the file HTC One EU Light Lockscreen with iFile (from Cydia) into the groovylock folder on my iphone (user/Library/groovylock)
- than i connect my iphone via ssh to my mac and copy the HTC ONE EU .... folder to my mac
- open it and open the LockBackground.html with Notepad++
- than press CTRL and F and search for "var locale"
- there you have to change the code from yahoo weather and safe.
- copy the folder back to your iphone - restart - groovylock - HTC One.....
thats the way it works for me..
Also the problem with the 24 hours i changed today this way.. everything works fine..
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if you still need some help.. just write me...