@R-power , select default, in his guide he means you can either edit default.ini OR use my mod (which overwrites default.ini, so follow my instructions and itll be fine.)
my mod overwrites the default weather files with (IMO) improvements/fixes for things kunos missed (you have to install them as instructed in the description/readme), i dont bother adding additional ones as they will never be used online or in career.
it is possible to add further weather files from other mods, but that particular will be dark with my ppfilter until the author does an update to his files. but it is advisable to stick to one persons filter+weathers to avoid such issues.