Comment 9 for bug 1539930

For future possible hot fixes:
you can manually config applet at ~/.config/lxpanel/Lubuntu/panels/panel
section Plugin type=weather

with such config:

  Config {
    alias=kharkiv, ua
    city=Kharkiv
    state=Kharkiv Oblast
    country=Ukraine
    woeid=922137
    units=c
    interval=15
    enabled=1
  }

appropriate values you can find with similar request:

http://query.yahooapis.com/v1/public/yql?format=xml&q=SELECT%20*%20FROM%20geo.places%20WHERE%20text=%22Kharkiv%22