Orion is only seen during part of the year because it is one of the seasonal constellations, which means they can only be viewed during certain times of the year. Orion rises in the east at the beginning of the year, and it begins to set in the west at the beginning of May.
Orion is below the horizon for the remainder of the year. This means that Orion can only be observed around January and February, which is part of the best viewing period for Orion and all of its major and minor stars.