I'm not sure that this is only a remote monitoring topic but since the thread has started here:
The problem I see in linking a radiation counter to a weather station like a VP2 is that something like a Geiger counter tube circuit typically registers in counts, eg counts per minute. There's no input on a VP2 system to which you could easily attach a countre capable of say 1000cpm, let alone orders of magnitude above that. What's needed is a circuit that can convert cpm on to say a linear 0-3v scale so that a VP2 solar or UV or soil moisture or leaf wetness input could be used for monitoring. I dare say that such a circuit is standard fare for any electronics buffs here. But if there was some such circuit readily available (ideally as an ready-built or off-the-shelf item) then it should be easy enough to interface to one of the VP2 inputs mentioned above.