I have no idea of the distances myself. All I know, roughly, is that the closest is at 1km away from where "home base" would be (since it's installed right in their courtyard) and the furthest ones are 20km+ from "home base". There IS some documentation for this whole project, outlining where these stations are dropped along the canal, and I had a look at it myself at one point, but I didn't bother to remember anything because I didn't care at that point. The key word is "FAR" !

I probably have hundreds of pictures, several for each of the 12, although there's really nothing different other than their location - the boxes themselves are identical, so that's really all you need to see.
Temperature aspects: yes, I too thought of that. The temperature swings are going to be wild there! Freezing cold in the winter and boiling hot in the summer ! There IS actually a heater in there, in the form of a heatsink with what looks like a resistor in the middle of it, but it's not automated: someone has to go there and flip the MCB to turn it on. At the opposite end of the temperature spectrum, there is no fan to
cool the box ! The box cools down purely by natural airflow happening through those vents, which in some cases is not enough. Some boxes are in the shade, under foliage and trees and stuff, which helps to a degree, but most are out in the open...
As a side note, I created a small automation for my car's windows using an Arduino Pro Mini, but haven't installed it yet and I'm actually concerned whether it would survive in a car in the middle of summer when the inside temperatures can probably exceed 50c ! Only one way to find out and that is to take my project which is still on its breadboard inside the car, park the car in direct sunlight and let it roast on the passenger seat for a whole day under the scorching summer sun and then test it

This would replicate the conditions it'd have to face once I install it in the dashboard.