This gets asked a bunch, and the reason is that the answer is not a specific distance. WeatherXM uses hexagonal shaped cells (the uber H3 system) and the cell size of res7 (which may be familiar to you from Helium if you've seen that project). A res7 cell covers just under 6 sq km and from edge to edge is roughly 2.5 km.
Depending on where in the world the cell is, you'll have different density allowances. From the Designing a Global Weather Station Network document published by WXM meteorologist Stavros Keppas,
a cell may eventually require up to 8 weather stations (4 for differently oriented aspects, 1 for the highest area, 1 for the largest urban area, 1 for the largest urban green and 1 for the coastal area of a cell).Note that says may require. A very rough rule of thumb is that you probably don't want them closer than 750 meters apart, but again, that's rough. WeatherXM Cell Density Documentation: https://docs.google.com/document/d/1Cdr2sJ7cKMgymt6SI_5UwHs855FI8yizdjb-mJyFJnE/edit?usp=sharing
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