Write this type of letter for any situation in which you are communicating appreciation to your professor. You will likely need to modify this letter sample at least somewhat so that it most closely matches what you want to communicate. Include in your letter any pertinent details.
[Your letterhead, if desired; if not, your return address]
[Date of letter-month, day, and year]
[Recipient's first and last names]
[Street or P.O. box address]
[City, State ZIP code]
Dear [recipient's name]:
As the end of this semester draws near, I want to take a moment to let you know how very much I have appreciated having you as my professor for my sociology class. I am thankful for all that I have learned through your interesting and informative classes. I am also just as appreciative of your obvious caring and concern for all of your students, including me. It has meant so much to have a professor like you. I hope our paths will cross again soon, and perhaps I will have the privilege of being your student in another class.
Thank you again-I so appreciate all that you do. Have a wonderful and relaxing break between semesters.