Yes, stadium server includes slightly modified version of WeatherConditions.lua too, so that two scripts can play together
If you find that disabling weather .lua helps, then you can re-enable it and experiment further by editing "map_competitions.csv " file (see the link from
@superleeds1 ) - try changing weather probabilities for particular leagues. During in-game winter season, initial odds strongly prefer bad weather conditions (e.g. as you can see on the screenshot, only 20% for a good weather for both English divisions and for Spanish and Italian 1st division).
Sum of values for three summer percentage values must be 100. Also, sum of four winter values must also be 100.
If there are some missing leagues (.csv is taken from PES 2019,
so there aren't Spanish and Italian 2nd divisions in it edit: scratch that, .csv file seems to be up to date, all 2nd divisions already included

), you can easily add more rows with appropriate competition ID and 7 values