Hi ,
From what I remeber, when I loaded your program the first time there were no icons. And there was this link
Weather Element List and Suggested Icons - NOAA's National Weather Service
to download the images.
The link in your post doesn't work.
In googeling I found thos one
Weatherstation Salo, Halikko - Weatherstation Salo, Halikko, FI
and then click on
Weathericons
Best regards.