OK, the sunrise and sunset times are clearly not being set (6:00 and 18:00 are the initial values). So this confirms my suspicion that something is blocking the result of the query. As an initial diagnose, you can open a browser and try the following url:
http://weather.opensprinkler.com/weather0.py?loc=Inver%20Grove%20Heights,%20MN
see what you get.
Another thing you can try is to use your zip code instead of your city name. See if that makes any difference.