Here. Guys from Acclaim and Charybdis tried to implement this, as you might see here, but for some reason, they didn't. Who knows why? Maybe it's because of their low budget or very little time?
That doesn't matter now, anyway, because I think we've got to implement weathers to OpenMachines.

Furthermore, I think we should allow the player to detect and maybe even alter current weather during the gameplay? So Technicians won't be useless after you research everything in all the labs.

Weather based warfare sounds plausible since modifying the atmosphere of planets is what they do best in the first place.
But appart from that, from an esthetic point of view it would look very good. For example, the sights that the recent incident of the volcano in Chile generated made me think of the machines in the middle of an ash storm (couldn't move very well obviously).
Or even better: the machines waited for humans. I always imagined the machines waiting under the sun, the rain, the wind (many seasons and climate changes), etc.

Can't say this would be good in anything other than campaign without breaking the game.

@bilal
You're right. We should include this in Machines 2/Open Machines.

@bilal said:

Can't say this would be good in anything other than campaign without breaking the game.

Yup, that's kinda true... but it depends where and when it'll get introduced. For example, I always wanted to see a sandstorm in Machines - maybe it should be added to OpenMachines?

Also, I've had this crazy idea: what if you fire too many nukes, and the map you're playing on will permanently change the weather to 'nuclear winter' until you or your opponent wins?

So, like, nuclear winter debuffs everything but makes nukes more effective - they'll recharge faster, cost less, deal more damage - basically true game-ending condition.

The nuclear winter would be an interesting feature. Yet, I'm not sure about the "experience, economies of scale, etc." involving the manufacturing of nukes. If you want it to be a true "game-ending" condition, then simply make that nuke more destructive (and expensive).