This is my first contribution to our.umbraco.org - Hopefully it makes some people happy :)
First things first... there is a limit on the upload size for projects... and this project has an extensive icon folder... you can download the icon package here...
http://packages.maliciousthinktank.com/data/packages/mtt_weather_iconSet1_2.zip
Hopefully there will be other icon sets contributed here.
What is installed...
how to use...
use the insert macro button on one of your templates and specify your zip code [usa] or location code [elsewhere], specify the text for the header of the macro and specify an F or C for your unit of measurment.
Let me know if you have any questions.