Does it give an accurate or semi-accurate reading on wind speed? That's why I bought it. If it doesn't, I will take it back.

The National Weather Service recommends mounting the sensor 33 feet above ground with no obstructions within 100 feet for the most accurate wind speeds. You should receive an accurate reading for where it is mounted. We understand not all of our customers can mount this high. If you are comparing to a local news station, they typically follow the National Weather Service guidelines.