Hello EO, would this mod work with the map called "New Esseker" or you would need to do a new version?

As far as immersion just TPW.

@dougmiasdad, If by "spring-like day"you mean the sky was completely cloudless, then there is a possible mod conflict. What other mods do you run when playing this mission?

All I can tell you is SullenSkies works as intended on Esseker, here is a screenshot I just took with overcast set to 0.....
https://i.imgur.com/xtgW7Iz.jpg

Sullen Skies changes the cloud and overcast classes on any of the supported maps, and will work with whatever dynamic weather settings are applied. Hope this helps you out a little. ;-)

Will this overirde mission parameters(do I need to disable dynamic weather)?Enabled it on GR Floros Salvation esseker and still had spring-like sky