|We say on + days of the week- on Monday, on Tuesday, etc.
ex. I saw her on Sunday morning.
We say at the weekend.
ex. We went to the movies at the weekend.
Autumn (Am. E. Fall)
We say in + months/seasons-ex. In July, in winter, but on July 7th.
I love doing snowboarding in winter.
My birthday is in August.
Susan’s birthday in on August 17th.
Her birthday is on July 2. (on July second)
The 2nd of July is her birthday. (the second of July)