Cool day

It was a cool, breezy day today. Nice cool wind breeze. I feel so wonderful. 
In summer hot days are getting increase year by year. The number of hot summer days has been increasing year by year. <- (Present Perfect Continuous is used because it started in the past, but the number is still changing.) There were a few hot summer days like summer already in May already. <- (Past Simple Tense is used because the time is specified.) On a hot summer day, I feel like eating frappe with strawberry syrup and milk on top. on a hot summer day 

Note: The word 'increasing' is of a formal nature, so you should find a suitable informal synonym. :)

Cool day

It was a cool day today, with a nice, cool breeze. I feel so wonderful.
In summer, hot days are increasing year by year. There have already been a few hot, summery days in May. I feel like eating frappe with strawberry syrup and milk on top on a hot summer's day.

Cool day

It was a cool day today. There was a nice, cool breeze of wind. I felt so wonderful.
In summer, the hot days are getting longer year by year. There were a few hot days like summer already in May. I feel like eating flappe* with strawberry syrup and milk on top on a hot summer day.

*what is "flappe"? sorry, i'm not sure. :(

Good job! :)

Cool day

It was cool day today, with a nice cool wind breeze. I feel so wonderful.
In summer hot days are getting increase year by year.

The hot summer days are increasing year by year.

There were a few hot days like summer already in May.

There were a few hot summer days already in May. 

I feel like eating ?flappe? with strawberry syrup and milk on top on hot summer day.

This is really good, keep going. Well done.