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Tempus Attritio

With this mod, anytime an army is in an enemy region during certain seasons, that army will automatically suffer attrition.

The seasons that will make you or AI armies suffer attrition in enemy territory are: winter, harsh winter, extreme winter, extreme summer, blazing hot summer, wet summer, late autumn and late spring.

This attrition is separate from the attrition already in the game (i.e. when you march over snow, deserts, swamps, or mountain passes). In other words, it doesn't matter if you still march on the roads; you're still losing units if you're in enemy territory during these seasons.

The intent behind all this is to introduce more planning and strategy to your invasions. It might not be a good idea to get into prolonged fighting in a northern province prone to extreme winters, or a desert province prone to extreme summers. Measuring out your conquests, making ample use of reserve forces, and employing allied, client state or your own territory for winter/summer quarters now become more necessary strategies.

This mod is in large part based off Dresden's seasonal effects mod. I just expanded the attrition and tinkered with a few other things. Hope you enjoy it!