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During campaigns and matches where the weather is set to random, a random game mechanic called weather might occur, causing different types of effects on the battlefield for the duration of the weather. Random weather effects only last for 1 day.

Some COs can actively increase the frequency of a specific type of weather occurring with their CO ability, or outright change the weather using their CO Power.

Clear

When the weather is clear, no extra penalties are imposed on units, making it a usual and fair game.

Rain

Raining

Raining in Bean Island. Note how the Recon only has 4 vision compared to its normal 5.

During rain, movement of all land vehicular units will be inhibited by one when crossing through terrains that impose a movement penalty. For example, cities don't have a movement penalty, so during rain, all units still only use 1 movement point to go through it. For plains, which normally require 2 and 1 movement point for units traveling on tires and tread respectively to pass through, now use up 3 and 2 movement points. The vision range for all units during Fog of War is also reduced by 1.

For the Blue Moon CO Olaf, movement points required for all his air and naval units to travel across all terrains is doubled, while his Infantries' movement through all non-property terrains, and his Mechs' across mountains is halved.

Rain could greatly affect your vehicular units in both deployment and retreat. When Drake is present in a match, rain does not affect his units' movement and the chance of rain occurring during random weather is increased by 7%.

Snow

Snow standard

Snow affecting a CO's Battleship, halving its movement range on Sea from 5 to 2

Snow Olaf

...while Olaf's Battleship is unaffected, traveling 5 tiles like usual

The movement penalty during snow is even more severe than rain. As well as increasing the movement penalty of all land vehicular units traveling across non-road and non-property terrains by one, Infantry, air and naval units require double the normal movement points needed to traverse all terrains. For Mechs, they require one extra move to go through mountains. Units' vision range in Fog of War is unaffected during snow. In Advance Wars: Dual Strike, snow also doubles the Fuel usage for all units.

Snow makes deploying your units to the frontline all the more difficult, with most units' movement range reduced one way or another. Non-air units going through properties don't suffer any movement penalties in snow as well as rain, so make use of them when moving your units.

Olaf's units don't suffer any penalties during snow, meaning his units' movement and fuel usage is unimpaired. This gives Olaf a momentous advantage in snowy maps, or matches in which the weather condition is set to random. Olaf could also use his CO Power or Super CO Power to cause snow to fall on the map for 1 turn, or 2 turns in Dual Strike.

Units under command of Black Hole CO Sturm can only have their movement impaired during snow, during which the usual snow penalty plays out.

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