The default weather application for the iPhone uses the yahoo weather service which is notoriously inaccurate for Australian weather compared to the Australian Bureau of Meteorology (BOM). Australian BOM Weather+ is a tweak to get accurate Bureau of Meteorology weather information on the iPhone. It also provides BOM weather for the Notification Center Weather Widget and some other jail break applications including Weather Icon and Weather Plugins for LockInfo as well as WinterBoard lock screen themes that use yahoo weather data.
Any information that isn’t held by the BOM will show yahoo data. For example, if the BOM only provides a 3 day forecast for your location the forecast for days 4, 5 and 6 will come from yahoo. Also, BOM locations don’t match yahoo locations exactly. To see what BOM location your location is mapped to click here.
All weather information provided by Australian BOM Weather for the iPhone is copyright the Bureau of Meteorology.
There are no new icons added to the homescreen. Configure options from the Settings app
For more information see the Developer’s Page below