This client mod for Ago's client Modloader will let you configure what season is display for just your client.
Required:Ago's WurmServerModLauncher. https://github.com/ago1024/WurmClientModLauncher/releases
:Install:
* It should almost always work. I've yet had to update this because it broke. I did recently put it on GitHub.
* Get a archive release for the mod here: https://github.com/Joedobo27/SeasonConfigureMod/releases
* Get one of the archive releases and unpack it into the WU client folder folder. The folder path should look something like this:
~\Steam\SteamApps\common\Wurm Unlimited\WurmLauncher
The seasonal length divisions are based in theory on the cosine wave math which the client uses to fluctuate temperatures and cycle seasons. I haven't done actual empirical testing. Let me know if it doesn't seem right.
Here's the configure file: