Okay, I'm not sure if there is any suggestion that has weather in it, but I'll add my idea.
- Weather: Snow, rain etc.
Effects like snow would hamper, or boost armies. If this is introduced, my take:
Militia: 50% Boost in snow, elite militia gets an 80%
Commando: 50% Boost in snow
Infantry: No boost, but elite infantry gets a 10%
Tank units: 35% weaker, elite tanks 20%
Air units: 10% weaker for tact. bombers
For rain, similar effects, like:
Militia: 20% Boost, elite militia gets 35%
Commando: 15% Boost
Infantry: 10% Boost
- Weather: Display
When weather happens, you can see weather in your borders and one province surrounding (share intel shares weather) When you click on a province, it would show a the weather. When zoomed out, it only shows the major events.
- Spy:
When you have intelligence spies, they can inform you of the weather in provinces. And when they give info, your units that are at a disadvantage in weather like snow, have a weaker disadvantage (like from 35% to 25) (because then they're prepared)