What is a good WIFI signal strength?

In the mobile app you will usually see a number next to the WIFI symbol for each of your sensors. This number is the RSSI value, which indicates the strength of the WIFI connection for that sensor. These values can be interpreted as follows: 

>-30: Excellent
-50 to -60: Good
-60 to -70: Fair
-70 to -80: Weak, but acceptable
<-80: Weak, may lead to connection issues