Rain showing N/A in system tray

I noticed today that my system tray has N/A for rain data. I have a local Weather Underground station as my default but when I changed to Weatherbug and other Weather Underground stations they all have rain data.

Where does the actual data come from? I’d always thought it was WA/WB itself and not the station but now I’m not sure.

Since it’s showing N/A would that be because there’s a glitch with that station or they don’t track it in the first place?

This is a screen shot of the WU system tray.

http://s13.postimg.org/g5mblq4nn/2015_07_17_090714.jpg

The rain data from your screenshot above comes from the weather station. Some weather stations do not collect rain data and/or report it. The rain data in the forecast should still be available though.