As K6MFW said, not every station is RF. I'm the Assistant EC for SKYWARN in my county, and have my weather station set up at my house but not connected to APRS via RF. I broadcast every minute for instantaneous wind gust readings, as my station is in the basement, and I am not always down there. I can check on Findu.com and see what's going on at my station with almost instantaneous data. If I were doing this with RF, I'd certainly not be updating every minute, but living in West Central Ohio, weather can change very quickly from a nice sunny day to a violent thunderstorm. I'm not clogging the RF spectrum with my data, and my internet reporting uses up less bandwidth than a picture of my cats on Facebook.