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Weather is a plug-in that is available for free. You can find and enable Weather in the Optional Features section of the app. By default this setting is disabled because it might lag your server due to increased workload. If you feel like your server is lagging while using Weather then try disabling it.
When this plug-in is enabled weather effects such as rain and thunder may spawn on your server.
Have a question about the plug-in Weather? Ask it on the forums here!