RFM69CW 915 Mhz I/F to La Crosse Weather Station?

[pinaar]

I don't know what protocol this station uses, but my RFM69CW does receive data,
  raw:A5-B0-78-D1-45-A6-3E-10-26-65 station:5 packets:5/124/3.88 channel:47 rssi:-94 batt:ok windv:176 winddraw:120 windd:169 rh:123.0 fei:8 delta:2032245648
  raw:60-B2-C0-1F-5D-4C-18-F8-55-1A station:0 packets:6/155/3.73 channel:45 rssi:-94 batt:ok windv:178 winddraw:192 windd:265 solar:219.7 fei:7 delta:1087322464
but I don't know what that data comes from. I uploaded the VPTools-master/Examples/ISSRx/ISSRx.ino sketch to my Moteino R7 and it started receiving data about once an hour, but I think it's not on any fixed interval.
Can someone point me to how I might be able to make this work? I.e., I would I go about reverse engineering the RF packets? I have a rain sensor, LTV-WR1 which I could disassemble to see if there are any telltale chip numbers that might give me a clue on the protocol, but I wanted to see if anyone here has been down that road (besides the few dozen Google hits which didn't really reveal anything to me, yet).
Thanks - Art