I always hated how weather sites could not just detect my approximate location based off of ip (eg weather.com) and required me to enter in my zip code, google fixed that.
Pretty sure they got that after google. For years, wunderground was the best of a bunch of terrible web sites. They're still about 40% ads by pixel though, and have a hugely cluttered UI. I'll use them as a second step (Google's "detailed forecast" link) after typing "weather" into the chrome address bar. But broadly, they still suck compared to Google.
