Climate is what we expect, weather is what we get (Mark Twain).

Weather is an uncontrollable, yet predictable, feature in the game. As seasons change, some weathers predomine, but can have random happenings all the time. Weather can affect many buildings, each building having different weather effects and values.

Weather can be forecasted once the weather research is done, you will then be able to predict it up to four days ahead.

In the winter, even when sunny, temperatures are quite low, making necessary to have adequate heating and clothing for villagers. If not achieved, happiness will decrease and furthermore people can freeze, this results in a freezing production bar appearing underneath buildings when it is completed a person will die.

The daily climate can affect buildings differently, being positive or neutral when sunny and clouded, negative when raining and all-blocking when storming (except for …)

The base power of exposed buildings is affected by some weather conditions.

The base power of sheltered building is not affected by weather conditions.

Note: these lists aren't exhaustive (yet).