Original

Cold Day

The weather changed so quickly.i remembered that i wore T-shirt two days before.Now i must wear thick clothes for keep warm.I dislike the autumn in southern. I love my hometown's weather.Although its also cold ,the environment is nicer.All the trees are colorful.i love maple leaf cause it will turn red and look so nice.as this time,i will keep some into my books.I can't believe one thing is that i graduated two years,and i didn't have the free time to go back to my home in autumn.its a regret thing that i worked so far from my hometown.i remembered there are apple trees in front of my house .i love picked them in the morning when i got up.its so fresh and sweet.what i can do is put all the things into my heart.sometimes i dreamed i went back and flying in the sky .its a grate thing if it came true in future.

Corrections and Suggestions

A Cold Day

The weather has changed so quickly. i remembered that I wore a  T-shirt  only two days ago before. Now I must wear thick clothes for  just to keep warm. I dislike the autumn in  the South southern. I love my hometown's weather. Although it's also cold , the environment is nicer. All the trees are colorful. I love maple leaf because it will turn red and look so nice. as this time,i will  Currently I keep some pressed between the pages of into my books.I can't believe one thing is that I graduated two years ago ,and I didn't have the enough free time to go back to my home in autumn. its a regret thing that I regret that I worked so far from my hometown. I remembered there are apple trees in front of my house. I loved to pick them in the morning when I got up. They were  so fresh and sweet. What I can do is put all these things (memories)  into my heart. Sometimes I dream that I go  i went back and flying in the sky. It  would be a great thing if it came true in the future.

Notes - colorful is the American spelling. UK English uses colourful.

Some written English punctuation rules.

The letter I when referring to yourself is always a capital - not i.

Leave a space after a full stop --   This is the end.This is the beginning      This is the end. This is the beginning

You have some minor problems with mixing past, present and future tense.

I have capitalized the word South since it refers to the south of your country so you can think of it as a proper place.

its  is possessive (its claw for example) , you meant it's which is short for it is

I have left these sentences mostly untouched.  i love maple leaf cause it will turn red and look so nice.as this time,i will keep some into my books.

You could write them as "I love maples because the leaves turn red in autumn and look so nice. Currently I keep some leaves pressed between the pages of my books."  I suggest this construction as the second sentence indicates that you are now talking about the maple leaves rather than the whole tree.

On the whole, this is a good English composition, you have managed to express  your ideas and feelings about your new home and the longing for your old home across to the reader. That is very good for someone writing in a foreign language, especially a language with a sentence structure so different from your own. Keep up the good work.