Why are tropical cyclones not likely to occur in mid-latitude regions?

There are conditions to be met in order to form a tropical cyclone. First, tropical cyclones needs a warm ocean of at least 81 degrees C to develop which is only mostly present in tropical regions where large bodies of water is present and year-round exposure to sunlight. Although mid-latitude areas may have some parts near these oceans, mid-latitude regions are temperate thus, the required ocean temperature cannot be met.