Bog standard RC?
Brainstorming away...
For the radio link; as you only want a couple of vaiables relaying, how about taking the RC idea of pulse width modulation and transmitting the signals on a (basically) audio carrier?
You mention something like the 2m band so the miles are no problem with this idea, some sort of encoder could just plug into the microphone socket of an off-the-shelf hand-held.
For wind speed and direction; can you find a cheap domestic gizmo ready-made (maybe RadioShack do something?), cannibalise, rather than re-invent?