Load the editor , place a soldier 100 meters away , throw a smoke grenade in between and switch to thermal , notice how smoke covers heat imaging(Not just the soldier's but the general environment).

For the fog repeat the same with fog 100% this time , switch to thermals . Notice that in the fog the IR vision stops where natural eye vision also stops.

And for the environment temp change just place a unit , change the date to a summer month and watch it with thermals , then switch to a winter month and observe that thermal imaging (of the unit and the environment) is the same as before.

I have tested this with the laser designator , hunter gmg and kamysh apc.

I haven't tested the clouds yet but i doubt they work correctly.

Anyone with knowledge is more than welcome to add to the subject as my knowledge is only in the physics behind these machines and not on the devices themselves.

An other thing to note is that thermal imaging of a soldier changes with night/day (which is already simulated in arma 3) , just not to confuse with climate and season change.

Also this is not a balancing/nerfing thing , it is about simulating properly IR vision like in reality.