did you get the errors because you loaded the jQuery second?
because it works for me
weather-test 2.zip (47.5 KB)
Also i used this library this week for an ad that called on weather, if you want a hype example of this library being used here's a source file
ad_banner.zip (285.5 KB)
It gets Toronto's weather tommorow and because client only had 4 weather state images i had to take yahoo's conditions and break them down into 4.
var cloud = [0,1,2,3,4,19,20,21,22,23,24,26,27,28,29,30,44]
,snow = [5,7,13,14,15,16,17,18,25,41,42,43,46]
,sun = [31,32,33,34,36,3200];