1. It sometimes snows ____ November.

ON is wrong
Could anyone give me simple explaination why preposition IN is wrong uses for these sentences above?I’m just doing online test but i got the re-correction answer like that.Thanks

Yes, in is correct, on is wrong.
The explanation is that with months you use only in, as in “In November, in January”
With days of the week you use “on”, as in “on Friday, on Monday”

Ok,Thank you for your explaination.Regards,Yordanus