View animated weather history in the video below. Watch as storm systems roll across the planet.


  • Weather comprises an important part of OC’s world model.
  • The weather system generates temperature, humidity, and wind velocity data for every location in a world.
  • The world’s weather system uses its climate model to generate and move moisture fronts across the world.
  • These factors combine to produce the various weather effects, like rain, snow, and sandstorms. Some of OC’s weather effects are illustrated below.
  • Weather is affected tremendously by the day and night cycles and annual seasonal cycles of the time system.
  • Weather has all sorts of effects on the inhabitants of OC. Wet and cold conditions can cause negative experiences in humans that are stuck outdoors. Heat waves can decrease the activity of creatures with low heat tolerance. Lack of wind can render wind-driven power stations useless. Cloudy conditions defeat solar generators. Combat is affected by the weather in a multitude of ways. The list could go on, but weather is an extremely part of OC.

A snowstorm over a frigid swamp.

Weather History

To view weather history, open the world map view from the task bar and select the weather view of your choosing from the drop down menu at the top right of the interface. Cloud cover or precipitation can be chosen. To view history, use the time slider to control the time in the past (or present, by moving the slider all the way to the right) for which weather information is shown. For example, the screenshot below shows a view of current cloud cover.


Sometimes sliding through weather is very slow, due to all the calculations necessary for rendering weather data. Clicking the “Build Weather Images Cache” button will make it easy to slide through many historical timestamps, allowing you to view animated weather history. This caching process can take a significant amount of time, especially for large worlds with lengthy histories.

Current Conditions

Current weather conditions for any location can be viewed via the tile inspection dialog, in the “Tile Conditions” section.


Weather Effects

A variety of weather effects can occur in OC. These depend on moisture levels, wind ratings, temperature, topography, and other factors. This section shows screenshots of just a few examples of weather effects, to give a general idea of conditions that can arise.

Rain among stubby trees in an alpine region:


An extreme tropical storm in a coastal region of marshy jungle:


A sandstorm during high winds in a desert:


Accumulating Snowfall

Although weather has a large variety of effects on a world in OC, one of the most visible sorts of changes is the accumulation of snowpack. Winter storms can bring heavy snowfall to regions, and the resulting snow can accumulate on the terrain and change many of its characteristics. The following series of screenshots show a winter storm enveloping a region of frigid swamp bordered by a temperate rain forest.

In the first screenshot, the temperature is too warm for snow, and the storm starts as a heavy rain event.


Several hours later, in the second screenshot, the temperature has fallen and the rain has turned to snow:


Several more hours later, after nightfall, snow accumulations have blanketed the ground. The shallow creek has also been rapidly affected by the plummeting temperatures:


Farther east, at a slightly lower elevation, you can see the delineation between significant and insignificant snow accumulation as the storm expands into a new area.


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